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![Sunil Mushran](/assets/img/avatar_default.png)
dlm_wait_for_node_death() and dlm_wait_for_node_recovery() needed a facelift. Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
2886 lines
85 KiB
C
2886 lines
85 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* dlmrecovery.c
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*
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* recovery stuff
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*
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* Copyright (C) 2004 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/highmem.h>
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#include <linux/init.h>
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#include <linux/sysctl.h>
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#include <linux/random.h>
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#include <linux/blkdev.h>
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#include <linux/socket.h>
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#include <linux/inet.h>
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#include <linux/timer.h>
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#include <linux/kthread.h>
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#include <linux/delay.h>
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#include "cluster/heartbeat.h"
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#include "cluster/nodemanager.h"
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#include "cluster/tcp.h"
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#include "dlmapi.h"
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#include "dlmcommon.h"
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#include "dlmdomain.h"
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#define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_RECOVERY)
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#include "cluster/masklog.h"
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static void dlm_do_local_recovery_cleanup(struct dlm_ctxt *dlm, u8 dead_node);
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static int dlm_recovery_thread(void *data);
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void dlm_complete_recovery_thread(struct dlm_ctxt *dlm);
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int dlm_launch_recovery_thread(struct dlm_ctxt *dlm);
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void dlm_kick_recovery_thread(struct dlm_ctxt *dlm);
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static int dlm_do_recovery(struct dlm_ctxt *dlm);
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static int dlm_pick_recovery_master(struct dlm_ctxt *dlm);
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static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node);
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static int dlm_init_recovery_area(struct dlm_ctxt *dlm, u8 dead_node);
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static int dlm_request_all_locks(struct dlm_ctxt *dlm,
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u8 request_from, u8 dead_node);
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static void dlm_destroy_recovery_area(struct dlm_ctxt *dlm, u8 dead_node);
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static inline int dlm_num_locks_in_lockres(struct dlm_lock_resource *res);
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static void dlm_init_migratable_lockres(struct dlm_migratable_lockres *mres,
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const char *lockname, int namelen,
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int total_locks, u64 cookie,
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u8 flags, u8 master);
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static int dlm_send_mig_lockres_msg(struct dlm_ctxt *dlm,
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struct dlm_migratable_lockres *mres,
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u8 send_to,
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struct dlm_lock_resource *res,
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int total_locks);
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static int dlm_process_recovery_data(struct dlm_ctxt *dlm,
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struct dlm_lock_resource *res,
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struct dlm_migratable_lockres *mres);
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static int dlm_send_finalize_reco_message(struct dlm_ctxt *dlm);
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static int dlm_send_all_done_msg(struct dlm_ctxt *dlm,
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u8 dead_node, u8 send_to);
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static int dlm_send_begin_reco_message(struct dlm_ctxt *dlm, u8 dead_node);
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static void dlm_move_reco_locks_to_list(struct dlm_ctxt *dlm,
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struct list_head *list, u8 dead_node);
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static void dlm_finish_local_lockres_recovery(struct dlm_ctxt *dlm,
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u8 dead_node, u8 new_master);
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static void dlm_reco_ast(void *astdata);
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static void dlm_reco_bast(void *astdata, int blocked_type);
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static void dlm_reco_unlock_ast(void *astdata, enum dlm_status st);
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static void dlm_request_all_locks_worker(struct dlm_work_item *item,
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void *data);
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static void dlm_mig_lockres_worker(struct dlm_work_item *item, void *data);
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static int dlm_lockres_master_requery(struct dlm_ctxt *dlm,
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struct dlm_lock_resource *res,
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u8 *real_master);
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static u64 dlm_get_next_mig_cookie(void);
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static DEFINE_SPINLOCK(dlm_reco_state_lock);
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static DEFINE_SPINLOCK(dlm_mig_cookie_lock);
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static u64 dlm_mig_cookie = 1;
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static u64 dlm_get_next_mig_cookie(void)
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{
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u64 c;
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spin_lock(&dlm_mig_cookie_lock);
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c = dlm_mig_cookie;
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if (dlm_mig_cookie == (~0ULL))
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dlm_mig_cookie = 1;
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else
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dlm_mig_cookie++;
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spin_unlock(&dlm_mig_cookie_lock);
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return c;
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}
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static inline void dlm_set_reco_dead_node(struct dlm_ctxt *dlm,
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u8 dead_node)
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{
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assert_spin_locked(&dlm->spinlock);
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if (dlm->reco.dead_node != dead_node)
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mlog(0, "%s: changing dead_node from %u to %u\n",
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dlm->name, dlm->reco.dead_node, dead_node);
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dlm->reco.dead_node = dead_node;
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}
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static inline void dlm_set_reco_master(struct dlm_ctxt *dlm,
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u8 master)
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{
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assert_spin_locked(&dlm->spinlock);
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mlog(0, "%s: changing new_master from %u to %u\n",
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dlm->name, dlm->reco.new_master, master);
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dlm->reco.new_master = master;
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}
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static inline void __dlm_reset_recovery(struct dlm_ctxt *dlm)
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{
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assert_spin_locked(&dlm->spinlock);
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clear_bit(dlm->reco.dead_node, dlm->recovery_map);
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dlm_set_reco_dead_node(dlm, O2NM_INVALID_NODE_NUM);
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dlm_set_reco_master(dlm, O2NM_INVALID_NODE_NUM);
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}
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static inline void dlm_reset_recovery(struct dlm_ctxt *dlm)
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{
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spin_lock(&dlm->spinlock);
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__dlm_reset_recovery(dlm);
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spin_unlock(&dlm->spinlock);
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}
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/* Worker function used during recovery. */
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void dlm_dispatch_work(struct work_struct *work)
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{
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struct dlm_ctxt *dlm =
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container_of(work, struct dlm_ctxt, dispatched_work);
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LIST_HEAD(tmp_list);
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struct dlm_work_item *item, *next;
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dlm_workfunc_t *workfunc;
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int tot=0;
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spin_lock(&dlm->work_lock);
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list_splice_init(&dlm->work_list, &tmp_list);
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spin_unlock(&dlm->work_lock);
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list_for_each_entry(item, &tmp_list, list) {
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tot++;
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}
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mlog(0, "%s: work thread has %d work items\n", dlm->name, tot);
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list_for_each_entry_safe(item, next, &tmp_list, list) {
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workfunc = item->func;
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list_del_init(&item->list);
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/* already have ref on dlm to avoid having
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* it disappear. just double-check. */
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BUG_ON(item->dlm != dlm);
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/* this is allowed to sleep and
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* call network stuff */
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workfunc(item, item->data);
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dlm_put(dlm);
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kfree(item);
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}
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}
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/*
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* RECOVERY THREAD
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*/
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void dlm_kick_recovery_thread(struct dlm_ctxt *dlm)
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{
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/* wake the recovery thread
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* this will wake the reco thread in one of three places
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* 1) sleeping with no recovery happening
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* 2) sleeping with recovery mastered elsewhere
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* 3) recovery mastered here, waiting on reco data */
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wake_up(&dlm->dlm_reco_thread_wq);
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}
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/* Launch the recovery thread */
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int dlm_launch_recovery_thread(struct dlm_ctxt *dlm)
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{
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mlog(0, "starting dlm recovery thread...\n");
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dlm->dlm_reco_thread_task = kthread_run(dlm_recovery_thread, dlm,
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"dlm_reco_thread");
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if (IS_ERR(dlm->dlm_reco_thread_task)) {
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mlog_errno(PTR_ERR(dlm->dlm_reco_thread_task));
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dlm->dlm_reco_thread_task = NULL;
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return -EINVAL;
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}
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return 0;
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}
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void dlm_complete_recovery_thread(struct dlm_ctxt *dlm)
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{
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if (dlm->dlm_reco_thread_task) {
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mlog(0, "waiting for dlm recovery thread to exit\n");
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kthread_stop(dlm->dlm_reco_thread_task);
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dlm->dlm_reco_thread_task = NULL;
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}
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}
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/*
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* this is lame, but here's how recovery works...
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* 1) all recovery threads cluster wide will work on recovering
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* ONE node at a time
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* 2) negotiate who will take over all the locks for the dead node.
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* thats right... ALL the locks.
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* 3) once a new master is chosen, everyone scans all locks
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* and moves aside those mastered by the dead guy
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* 4) each of these locks should be locked until recovery is done
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* 5) the new master collects up all of secondary lock queue info
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* one lock at a time, forcing each node to communicate back
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* before continuing
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* 6) each secondary lock queue responds with the full known lock info
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* 7) once the new master has run all its locks, it sends a ALLDONE!
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* message to everyone
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* 8) upon receiving this message, the secondary queue node unlocks
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* and responds to the ALLDONE
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* 9) once the new master gets responses from everyone, he unlocks
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* everything and recovery for this dead node is done
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*10) go back to 2) while there are still dead nodes
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*
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*/
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static void dlm_print_reco_node_status(struct dlm_ctxt *dlm)
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{
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struct dlm_reco_node_data *ndata;
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struct dlm_lock_resource *res;
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mlog(ML_NOTICE, "%s(%d): recovery info, state=%s, dead=%u, master=%u\n",
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dlm->name, task_pid_nr(dlm->dlm_reco_thread_task),
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dlm->reco.state & DLM_RECO_STATE_ACTIVE ? "ACTIVE" : "inactive",
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dlm->reco.dead_node, dlm->reco.new_master);
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list_for_each_entry(ndata, &dlm->reco.node_data, list) {
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char *st = "unknown";
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switch (ndata->state) {
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case DLM_RECO_NODE_DATA_INIT:
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st = "init";
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break;
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case DLM_RECO_NODE_DATA_REQUESTING:
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st = "requesting";
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break;
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case DLM_RECO_NODE_DATA_DEAD:
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st = "dead";
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break;
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case DLM_RECO_NODE_DATA_RECEIVING:
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st = "receiving";
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break;
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case DLM_RECO_NODE_DATA_REQUESTED:
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st = "requested";
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break;
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case DLM_RECO_NODE_DATA_DONE:
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st = "done";
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break;
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case DLM_RECO_NODE_DATA_FINALIZE_SENT:
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st = "finalize-sent";
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break;
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default:
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st = "bad";
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break;
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}
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mlog(ML_NOTICE, "%s: reco state, node %u, state=%s\n",
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dlm->name, ndata->node_num, st);
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}
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list_for_each_entry(res, &dlm->reco.resources, recovering) {
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mlog(ML_NOTICE, "%s: lockres %.*s on recovering list\n",
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dlm->name, res->lockname.len, res->lockname.name);
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}
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}
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#define DLM_RECO_THREAD_TIMEOUT_MS (5 * 1000)
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static int dlm_recovery_thread(void *data)
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{
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int status;
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struct dlm_ctxt *dlm = data;
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unsigned long timeout = msecs_to_jiffies(DLM_RECO_THREAD_TIMEOUT_MS);
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mlog(0, "dlm thread running for %s...\n", dlm->name);
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while (!kthread_should_stop()) {
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if (dlm_domain_fully_joined(dlm)) {
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status = dlm_do_recovery(dlm);
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if (status == -EAGAIN) {
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/* do not sleep, recheck immediately. */
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continue;
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}
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if (status < 0)
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mlog_errno(status);
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}
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wait_event_interruptible_timeout(dlm->dlm_reco_thread_wq,
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kthread_should_stop(),
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timeout);
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}
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mlog(0, "quitting DLM recovery thread\n");
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return 0;
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}
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/* returns true when the recovery master has contacted us */
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static int dlm_reco_master_ready(struct dlm_ctxt *dlm)
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{
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int ready;
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spin_lock(&dlm->spinlock);
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ready = (dlm->reco.new_master != O2NM_INVALID_NODE_NUM);
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spin_unlock(&dlm->spinlock);
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return ready;
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}
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/* returns true if node is no longer in the domain
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* could be dead or just not joined */
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int dlm_is_node_dead(struct dlm_ctxt *dlm, u8 node)
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{
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int dead;
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spin_lock(&dlm->spinlock);
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dead = !test_bit(node, dlm->domain_map);
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spin_unlock(&dlm->spinlock);
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return dead;
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}
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/* returns true if node is no longer in the domain
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* could be dead or just not joined */
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static int dlm_is_node_recovered(struct dlm_ctxt *dlm, u8 node)
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{
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int recovered;
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spin_lock(&dlm->spinlock);
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recovered = !test_bit(node, dlm->recovery_map);
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spin_unlock(&dlm->spinlock);
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return recovered;
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}
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void dlm_wait_for_node_death(struct dlm_ctxt *dlm, u8 node, int timeout)
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{
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if (dlm_is_node_dead(dlm, node))
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return;
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printk(KERN_NOTICE "o2dlm: Waiting on the death of node %u in "
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"domain %s\n", node, dlm->name);
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if (timeout)
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wait_event_timeout(dlm->dlm_reco_thread_wq,
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dlm_is_node_dead(dlm, node),
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msecs_to_jiffies(timeout));
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else
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wait_event(dlm->dlm_reco_thread_wq,
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dlm_is_node_dead(dlm, node));
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}
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void dlm_wait_for_node_recovery(struct dlm_ctxt *dlm, u8 node, int timeout)
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{
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if (dlm_is_node_recovered(dlm, node))
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return;
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printk(KERN_NOTICE "o2dlm: Waiting on the recovery of node %u in "
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"domain %s\n", node, dlm->name);
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if (timeout)
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wait_event_timeout(dlm->dlm_reco_thread_wq,
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dlm_is_node_recovered(dlm, node),
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msecs_to_jiffies(timeout));
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else
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wait_event(dlm->dlm_reco_thread_wq,
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dlm_is_node_recovered(dlm, node));
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}
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/* callers of the top-level api calls (dlmlock/dlmunlock) should
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* block on the dlm->reco.event when recovery is in progress.
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* the dlm recovery thread will set this state when it begins
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* recovering a dead node (as the new master or not) and clear
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* the state and wake as soon as all affected lock resources have
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* been marked with the RECOVERY flag */
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static int dlm_in_recovery(struct dlm_ctxt *dlm)
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{
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int in_recovery;
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spin_lock(&dlm->spinlock);
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in_recovery = !!(dlm->reco.state & DLM_RECO_STATE_ACTIVE);
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spin_unlock(&dlm->spinlock);
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return in_recovery;
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}
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void dlm_wait_for_recovery(struct dlm_ctxt *dlm)
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{
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if (dlm_in_recovery(dlm)) {
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mlog(0, "%s: reco thread %d in recovery: "
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"state=%d, master=%u, dead=%u\n",
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dlm->name, task_pid_nr(dlm->dlm_reco_thread_task),
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dlm->reco.state, dlm->reco.new_master,
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dlm->reco.dead_node);
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}
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wait_event(dlm->reco.event, !dlm_in_recovery(dlm));
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}
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static void dlm_begin_recovery(struct dlm_ctxt *dlm)
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{
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spin_lock(&dlm->spinlock);
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BUG_ON(dlm->reco.state & DLM_RECO_STATE_ACTIVE);
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printk(KERN_NOTICE "o2dlm: Begin recovery on domain %s for node %u\n",
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dlm->name, dlm->reco.dead_node);
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dlm->reco.state |= DLM_RECO_STATE_ACTIVE;
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spin_unlock(&dlm->spinlock);
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}
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static void dlm_end_recovery(struct dlm_ctxt *dlm)
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{
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spin_lock(&dlm->spinlock);
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BUG_ON(!(dlm->reco.state & DLM_RECO_STATE_ACTIVE));
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dlm->reco.state &= ~DLM_RECO_STATE_ACTIVE;
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spin_unlock(&dlm->spinlock);
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printk(KERN_NOTICE "o2dlm: End recovery on domain %s\n", dlm->name);
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wake_up(&dlm->reco.event);
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}
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static void dlm_print_recovery_master(struct dlm_ctxt *dlm)
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{
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printk(KERN_NOTICE "o2dlm: Node %u (%s) is the Recovery Master for the "
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"dead node %u in domain %s\n", dlm->reco.new_master,
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(dlm->node_num == dlm->reco.new_master ? "me" : "he"),
|
|
dlm->reco.dead_node, dlm->name);
|
|
}
|
|
|
|
static int dlm_do_recovery(struct dlm_ctxt *dlm)
|
|
{
|
|
int status = 0;
|
|
int ret;
|
|
|
|
spin_lock(&dlm->spinlock);
|
|
|
|
/* check to see if the new master has died */
|
|
if (dlm->reco.new_master != O2NM_INVALID_NODE_NUM &&
|
|
test_bit(dlm->reco.new_master, dlm->recovery_map)) {
|
|
mlog(0, "new master %u died while recovering %u!\n",
|
|
dlm->reco.new_master, dlm->reco.dead_node);
|
|
/* unset the new_master, leave dead_node */
|
|
dlm_set_reco_master(dlm, O2NM_INVALID_NODE_NUM);
|
|
}
|
|
|
|
/* select a target to recover */
|
|
if (dlm->reco.dead_node == O2NM_INVALID_NODE_NUM) {
|
|
int bit;
|
|
|
|
bit = find_next_bit (dlm->recovery_map, O2NM_MAX_NODES, 0);
|
|
if (bit >= O2NM_MAX_NODES || bit < 0)
|
|
dlm_set_reco_dead_node(dlm, O2NM_INVALID_NODE_NUM);
|
|
else
|
|
dlm_set_reco_dead_node(dlm, bit);
|
|
} else if (!test_bit(dlm->reco.dead_node, dlm->recovery_map)) {
|
|
/* BUG? */
|
|
mlog(ML_ERROR, "dead_node %u no longer in recovery map!\n",
|
|
dlm->reco.dead_node);
|
|
dlm_set_reco_dead_node(dlm, O2NM_INVALID_NODE_NUM);
|
|
}
|
|
|
|
if (dlm->reco.dead_node == O2NM_INVALID_NODE_NUM) {
|
|
// mlog(0, "nothing to recover! sleeping now!\n");
|
|
spin_unlock(&dlm->spinlock);
|
|
/* return to main thread loop and sleep. */
|
|
return 0;
|
|
}
|
|
mlog(0, "%s(%d):recovery thread found node %u in the recovery map!\n",
|
|
dlm->name, task_pid_nr(dlm->dlm_reco_thread_task),
|
|
dlm->reco.dead_node);
|
|
spin_unlock(&dlm->spinlock);
|
|
|
|
/* take write barrier */
|
|
/* (stops the list reshuffling thread, proxy ast handling) */
|
|
dlm_begin_recovery(dlm);
|
|
|
|
if (dlm->reco.new_master == dlm->node_num)
|
|
goto master_here;
|
|
|
|
if (dlm->reco.new_master == O2NM_INVALID_NODE_NUM) {
|
|
/* choose a new master, returns 0 if this node
|
|
* is the master, -EEXIST if it's another node.
|
|
* this does not return until a new master is chosen
|
|
* or recovery completes entirely. */
|
|
ret = dlm_pick_recovery_master(dlm);
|
|
if (!ret) {
|
|
/* already notified everyone. go. */
|
|
goto master_here;
|
|
}
|
|
mlog(0, "another node will master this recovery session.\n");
|
|
}
|
|
|
|
dlm_print_recovery_master(dlm);
|
|
|
|
/* it is safe to start everything back up here
|
|
* because all of the dead node's lock resources
|
|
* have been marked as in-recovery */
|
|
dlm_end_recovery(dlm);
|
|
|
|
/* sleep out in main dlm_recovery_thread loop. */
|
|
return 0;
|
|
|
|
master_here:
|
|
dlm_print_recovery_master(dlm);
|
|
|
|
status = dlm_remaster_locks(dlm, dlm->reco.dead_node);
|
|
if (status < 0) {
|
|
/* we should never hit this anymore */
|
|
mlog(ML_ERROR, "%s: Error %d remastering locks for node %u, "
|
|
"retrying.\n", dlm->name, status, dlm->reco.dead_node);
|
|
/* yield a bit to allow any final network messages
|
|
* to get handled on remaining nodes */
|
|
msleep(100);
|
|
} else {
|
|
/* success! see if any other nodes need recovery */
|
|
mlog(0, "DONE mastering recovery of %s:%u here(this=%u)!\n",
|
|
dlm->name, dlm->reco.dead_node, dlm->node_num);
|
|
dlm_reset_recovery(dlm);
|
|
}
|
|
dlm_end_recovery(dlm);
|
|
|
|
/* continue and look for another dead node */
|
|
return -EAGAIN;
|
|
}
|
|
|
|
static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node)
|
|
{
|
|
int status = 0;
|
|
struct dlm_reco_node_data *ndata;
|
|
int all_nodes_done;
|
|
int destroy = 0;
|
|
int pass = 0;
|
|
|
|
do {
|
|
/* we have become recovery master. there is no escaping
|
|
* this, so just keep trying until we get it. */
|
|
status = dlm_init_recovery_area(dlm, dead_node);
|
|
if (status < 0) {
|
|
mlog(ML_ERROR, "%s: failed to alloc recovery area, "
|
|
"retrying\n", dlm->name);
|
|
msleep(1000);
|
|
}
|
|
} while (status != 0);
|
|
|
|
/* safe to access the node data list without a lock, since this
|
|
* process is the only one to change the list */
|
|
list_for_each_entry(ndata, &dlm->reco.node_data, list) {
|
|
BUG_ON(ndata->state != DLM_RECO_NODE_DATA_INIT);
|
|
ndata->state = DLM_RECO_NODE_DATA_REQUESTING;
|
|
|
|
mlog(0, "%s: Requesting lock info from node %u\n", dlm->name,
|
|
ndata->node_num);
|
|
|
|
if (ndata->node_num == dlm->node_num) {
|
|
ndata->state = DLM_RECO_NODE_DATA_DONE;
|
|
continue;
|
|
}
|
|
|
|
do {
|
|
status = dlm_request_all_locks(dlm, ndata->node_num,
|
|
dead_node);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
if (dlm_is_host_down(status)) {
|
|
/* node died, ignore it for recovery */
|
|
status = 0;
|
|
ndata->state = DLM_RECO_NODE_DATA_DEAD;
|
|
/* wait for the domain map to catch up
|
|
* with the network state. */
|
|
wait_event_timeout(dlm->dlm_reco_thread_wq,
|
|
dlm_is_node_dead(dlm,
|
|
ndata->node_num),
|
|
msecs_to_jiffies(1000));
|
|
mlog(0, "waited 1 sec for %u, "
|
|
"dead? %s\n", ndata->node_num,
|
|
dlm_is_node_dead(dlm, ndata->node_num) ?
|
|
"yes" : "no");
|
|
} else {
|
|
/* -ENOMEM on the other node */
|
|
mlog(0, "%s: node %u returned "
|
|
"%d during recovery, retrying "
|
|
"after a short wait\n",
|
|
dlm->name, ndata->node_num,
|
|
status);
|
|
msleep(100);
|
|
}
|
|
}
|
|
} while (status != 0);
|
|
|
|
spin_lock(&dlm_reco_state_lock);
|
|
switch (ndata->state) {
|
|
case DLM_RECO_NODE_DATA_INIT:
|
|
case DLM_RECO_NODE_DATA_FINALIZE_SENT:
|
|
case DLM_RECO_NODE_DATA_REQUESTED:
|
|
BUG();
|
|
break;
|
|
case DLM_RECO_NODE_DATA_DEAD:
|
|
mlog(0, "node %u died after requesting "
|
|
"recovery info for node %u\n",
|
|
ndata->node_num, dead_node);
|
|
/* fine. don't need this node's info.
|
|
* continue without it. */
|
|
break;
|
|
case DLM_RECO_NODE_DATA_REQUESTING:
|
|
ndata->state = DLM_RECO_NODE_DATA_REQUESTED;
|
|
mlog(0, "now receiving recovery data from "
|
|
"node %u for dead node %u\n",
|
|
ndata->node_num, dead_node);
|
|
break;
|
|
case DLM_RECO_NODE_DATA_RECEIVING:
|
|
mlog(0, "already receiving recovery data from "
|
|
"node %u for dead node %u\n",
|
|
ndata->node_num, dead_node);
|
|
break;
|
|
case DLM_RECO_NODE_DATA_DONE:
|
|
mlog(0, "already DONE receiving recovery data "
|
|
"from node %u for dead node %u\n",
|
|
ndata->node_num, dead_node);
|
|
break;
|
|
}
|
|
spin_unlock(&dlm_reco_state_lock);
|
|
}
|
|
|
|
mlog(0, "%s: Done requesting all lock info\n", dlm->name);
|
|
|
|
/* nodes should be sending reco data now
|
|
* just need to wait */
|
|
|
|
while (1) {
|
|
/* check all the nodes now to see if we are
|
|
* done, or if anyone died */
|
|
all_nodes_done = 1;
|
|
spin_lock(&dlm_reco_state_lock);
|
|
list_for_each_entry(ndata, &dlm->reco.node_data, list) {
|
|
mlog(0, "checking recovery state of node %u\n",
|
|
ndata->node_num);
|
|
switch (ndata->state) {
|
|
case DLM_RECO_NODE_DATA_INIT:
|
|
case DLM_RECO_NODE_DATA_REQUESTING:
|
|
mlog(ML_ERROR, "bad ndata state for "
|
|
"node %u: state=%d\n",
|
|
ndata->node_num, ndata->state);
|
|
BUG();
|
|
break;
|
|
case DLM_RECO_NODE_DATA_DEAD:
|
|
mlog(0, "node %u died after "
|
|
"requesting recovery info for "
|
|
"node %u\n", ndata->node_num,
|
|
dead_node);
|
|
break;
|
|
case DLM_RECO_NODE_DATA_RECEIVING:
|
|
case DLM_RECO_NODE_DATA_REQUESTED:
|
|
mlog(0, "%s: node %u still in state %s\n",
|
|
dlm->name, ndata->node_num,
|
|
ndata->state==DLM_RECO_NODE_DATA_RECEIVING ?
|
|
"receiving" : "requested");
|
|
all_nodes_done = 0;
|
|
break;
|
|
case DLM_RECO_NODE_DATA_DONE:
|
|
mlog(0, "%s: node %u state is done\n",
|
|
dlm->name, ndata->node_num);
|
|
break;
|
|
case DLM_RECO_NODE_DATA_FINALIZE_SENT:
|
|
mlog(0, "%s: node %u state is finalize\n",
|
|
dlm->name, ndata->node_num);
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&dlm_reco_state_lock);
|
|
|
|
mlog(0, "pass #%d, all_nodes_done?: %s\n", ++pass,
|
|
all_nodes_done?"yes":"no");
|
|
if (all_nodes_done) {
|
|
int ret;
|
|
|
|
/* all nodes are now in DLM_RECO_NODE_DATA_DONE state
|
|
* just send a finalize message to everyone and
|
|
* clean up */
|
|
mlog(0, "all nodes are done! send finalize\n");
|
|
ret = dlm_send_finalize_reco_message(dlm);
|
|
if (ret < 0)
|
|
mlog_errno(ret);
|
|
|
|
spin_lock(&dlm->spinlock);
|
|
dlm_finish_local_lockres_recovery(dlm, dead_node,
|
|
dlm->node_num);
|
|
spin_unlock(&dlm->spinlock);
|
|
mlog(0, "should be done with recovery!\n");
|
|
|
|
mlog(0, "finishing recovery of %s at %lu, "
|
|
"dead=%u, this=%u, new=%u\n", dlm->name,
|
|
jiffies, dlm->reco.dead_node,
|
|
dlm->node_num, dlm->reco.new_master);
|
|
destroy = 1;
|
|
status = 0;
|
|
/* rescan everything marked dirty along the way */
|
|
dlm_kick_thread(dlm, NULL);
|
|
break;
|
|
}
|
|
/* wait to be signalled, with periodic timeout
|
|
* to check for node death */
|
|
wait_event_interruptible_timeout(dlm->dlm_reco_thread_wq,
|
|
kthread_should_stop(),
|
|
msecs_to_jiffies(DLM_RECO_THREAD_TIMEOUT_MS));
|
|
|
|
}
|
|
|
|
if (destroy)
|
|
dlm_destroy_recovery_area(dlm, dead_node);
|
|
|
|
return status;
|
|
}
|
|
|
|
static int dlm_init_recovery_area(struct dlm_ctxt *dlm, u8 dead_node)
|
|
{
|
|
int num=0;
|
|
struct dlm_reco_node_data *ndata;
|
|
|
|
spin_lock(&dlm->spinlock);
|
|
memcpy(dlm->reco.node_map, dlm->domain_map, sizeof(dlm->domain_map));
|
|
/* nodes can only be removed (by dying) after dropping
|
|
* this lock, and death will be trapped later, so this should do */
|
|
spin_unlock(&dlm->spinlock);
|
|
|
|
while (1) {
|
|
num = find_next_bit (dlm->reco.node_map, O2NM_MAX_NODES, num);
|
|
if (num >= O2NM_MAX_NODES) {
|
|
break;
|
|
}
|
|
BUG_ON(num == dead_node);
|
|
|
|
ndata = kzalloc(sizeof(*ndata), GFP_NOFS);
|
|
if (!ndata) {
|
|
dlm_destroy_recovery_area(dlm, dead_node);
|
|
return -ENOMEM;
|
|
}
|
|
ndata->node_num = num;
|
|
ndata->state = DLM_RECO_NODE_DATA_INIT;
|
|
spin_lock(&dlm_reco_state_lock);
|
|
list_add_tail(&ndata->list, &dlm->reco.node_data);
|
|
spin_unlock(&dlm_reco_state_lock);
|
|
num++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void dlm_destroy_recovery_area(struct dlm_ctxt *dlm, u8 dead_node)
|
|
{
|
|
struct dlm_reco_node_data *ndata, *next;
|
|
LIST_HEAD(tmplist);
|
|
|
|
spin_lock(&dlm_reco_state_lock);
|
|
list_splice_init(&dlm->reco.node_data, &tmplist);
|
|
spin_unlock(&dlm_reco_state_lock);
|
|
|
|
list_for_each_entry_safe(ndata, next, &tmplist, list) {
|
|
list_del_init(&ndata->list);
|
|
kfree(ndata);
|
|
}
|
|
}
|
|
|
|
static int dlm_request_all_locks(struct dlm_ctxt *dlm, u8 request_from,
|
|
u8 dead_node)
|
|
{
|
|
struct dlm_lock_request lr;
|
|
enum dlm_status ret;
|
|
|
|
mlog(0, "\n");
|
|
|
|
|
|
mlog(0, "dlm_request_all_locks: dead node is %u, sending request "
|
|
"to %u\n", dead_node, request_from);
|
|
|
|
memset(&lr, 0, sizeof(lr));
|
|
lr.node_idx = dlm->node_num;
|
|
lr.dead_node = dead_node;
|
|
|
|
// send message
|
|
ret = DLM_NOLOCKMGR;
|
|
ret = o2net_send_message(DLM_LOCK_REQUEST_MSG, dlm->key,
|
|
&lr, sizeof(lr), request_from, NULL);
|
|
|
|
/* negative status is handled by caller */
|
|
if (ret < 0)
|
|
mlog(ML_ERROR, "%s: Error %d send LOCK_REQUEST to node %u "
|
|
"to recover dead node %u\n", dlm->name, ret,
|
|
request_from, dead_node);
|
|
// return from here, then
|
|
// sleep until all received or error
|
|
return ret;
|
|
|
|
}
|
|
|
|
int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data,
|
|
void **ret_data)
|
|
{
|
|
struct dlm_ctxt *dlm = data;
|
|
struct dlm_lock_request *lr = (struct dlm_lock_request *)msg->buf;
|
|
char *buf = NULL;
|
|
struct dlm_work_item *item = NULL;
|
|
|
|
if (!dlm_grab(dlm))
|
|
return -EINVAL;
|
|
|
|
if (lr->dead_node != dlm->reco.dead_node) {
|
|
mlog(ML_ERROR, "%s: node %u sent dead_node=%u, but local "
|
|
"dead_node is %u\n", dlm->name, lr->node_idx,
|
|
lr->dead_node, dlm->reco.dead_node);
|
|
dlm_print_reco_node_status(dlm);
|
|
/* this is a hack */
|
|
dlm_put(dlm);
|
|
return -ENOMEM;
|
|
}
|
|
BUG_ON(lr->dead_node != dlm->reco.dead_node);
|
|
|
|
item = kzalloc(sizeof(*item), GFP_NOFS);
|
|
if (!item) {
|
|
dlm_put(dlm);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* this will get freed by dlm_request_all_locks_worker */
|
|
buf = (char *) __get_free_page(GFP_NOFS);
|
|
if (!buf) {
|
|
kfree(item);
|
|
dlm_put(dlm);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* queue up work for dlm_request_all_locks_worker */
|
|
dlm_grab(dlm); /* get an extra ref for the work item */
|
|
dlm_init_work_item(dlm, item, dlm_request_all_locks_worker, buf);
|
|
item->u.ral.reco_master = lr->node_idx;
|
|
item->u.ral.dead_node = lr->dead_node;
|
|
spin_lock(&dlm->work_lock);
|
|
list_add_tail(&item->list, &dlm->work_list);
|
|
spin_unlock(&dlm->work_lock);
|
|
queue_work(dlm->dlm_worker, &dlm->dispatched_work);
|
|
|
|
dlm_put(dlm);
|
|
return 0;
|
|
}
|
|
|
|
static void dlm_request_all_locks_worker(struct dlm_work_item *item, void *data)
|
|
{
|
|
struct dlm_migratable_lockres *mres;
|
|
struct dlm_lock_resource *res;
|
|
struct dlm_ctxt *dlm;
|
|
LIST_HEAD(resources);
|
|
int ret;
|
|
u8 dead_node, reco_master;
|
|
int skip_all_done = 0;
|
|
|
|
dlm = item->dlm;
|
|
dead_node = item->u.ral.dead_node;
|
|
reco_master = item->u.ral.reco_master;
|
|
mres = (struct dlm_migratable_lockres *)data;
|
|
|
|
mlog(0, "%s: recovery worker started, dead=%u, master=%u\n",
|
|
dlm->name, dead_node, reco_master);
|
|
|
|
if (dead_node != dlm->reco.dead_node ||
|
|
reco_master != dlm->reco.new_master) {
|
|
/* worker could have been created before the recovery master
|
|
* died. if so, do not continue, but do not error. */
|
|
if (dlm->reco.new_master == O2NM_INVALID_NODE_NUM) {
|
|
mlog(ML_NOTICE, "%s: will not send recovery state, "
|
|
"recovery master %u died, thread=(dead=%u,mas=%u)"
|
|
" current=(dead=%u,mas=%u)\n", dlm->name,
|
|
reco_master, dead_node, reco_master,
|
|
dlm->reco.dead_node, dlm->reco.new_master);
|
|
} else {
|
|
mlog(ML_NOTICE, "%s: reco state invalid: reco(dead=%u, "
|
|
"master=%u), request(dead=%u, master=%u)\n",
|
|
dlm->name, dlm->reco.dead_node,
|
|
dlm->reco.new_master, dead_node, reco_master);
|
|
}
|
|
goto leave;
|
|
}
|
|
|
|
/* lock resources should have already been moved to the
|
|
* dlm->reco.resources list. now move items from that list
|
|
* to a temp list if the dead owner matches. note that the
|
|
* whole cluster recovers only one node at a time, so we
|
|
* can safely move UNKNOWN lock resources for each recovery
|
|
* session. */
|
|
dlm_move_reco_locks_to_list(dlm, &resources, dead_node);
|
|
|
|
/* now we can begin blasting lockreses without the dlm lock */
|
|
|
|
/* any errors returned will be due to the new_master dying,
|
|
* the dlm_reco_thread should detect this */
|
|
list_for_each_entry(res, &resources, recovering) {
|
|
ret = dlm_send_one_lockres(dlm, res, mres, reco_master,
|
|
DLM_MRES_RECOVERY);
|
|
if (ret < 0) {
|
|
mlog(ML_ERROR, "%s: node %u went down while sending "
|
|
"recovery state for dead node %u, ret=%d\n", dlm->name,
|
|
reco_master, dead_node, ret);
|
|
skip_all_done = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* move the resources back to the list */
|
|
spin_lock(&dlm->spinlock);
|
|
list_splice_init(&resources, &dlm->reco.resources);
|
|
spin_unlock(&dlm->spinlock);
|
|
|
|
if (!skip_all_done) {
|
|
ret = dlm_send_all_done_msg(dlm, dead_node, reco_master);
|
|
if (ret < 0) {
|
|
mlog(ML_ERROR, "%s: node %u went down while sending "
|
|
"recovery all-done for dead node %u, ret=%d\n",
|
|
dlm->name, reco_master, dead_node, ret);
|
|
}
|
|
}
|
|
leave:
|
|
free_page((unsigned long)data);
|
|
}
|
|
|
|
|
|
static int dlm_send_all_done_msg(struct dlm_ctxt *dlm, u8 dead_node, u8 send_to)
|
|
{
|
|
int ret, tmpret;
|
|
struct dlm_reco_data_done done_msg;
|
|
|
|
memset(&done_msg, 0, sizeof(done_msg));
|
|
done_msg.node_idx = dlm->node_num;
|
|
done_msg.dead_node = dead_node;
|
|
mlog(0, "sending DATA DONE message to %u, "
|
|
"my node=%u, dead node=%u\n", send_to, done_msg.node_idx,
|
|
done_msg.dead_node);
|
|
|
|
ret = o2net_send_message(DLM_RECO_DATA_DONE_MSG, dlm->key, &done_msg,
|
|
sizeof(done_msg), send_to, &tmpret);
|
|
if (ret < 0) {
|
|
mlog(ML_ERROR, "%s: Error %d send RECO_DATA_DONE to node %u "
|
|
"to recover dead node %u\n", dlm->name, ret, send_to,
|
|
dead_node);
|
|
if (!dlm_is_host_down(ret)) {
|
|
BUG();
|
|
}
|
|
} else
|
|
ret = tmpret;
|
|
return ret;
|
|
}
|
|
|
|
|
|
int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data,
|
|
void **ret_data)
|
|
{
|
|
struct dlm_ctxt *dlm = data;
|
|
struct dlm_reco_data_done *done = (struct dlm_reco_data_done *)msg->buf;
|
|
struct dlm_reco_node_data *ndata = NULL;
|
|
int ret = -EINVAL;
|
|
|
|
if (!dlm_grab(dlm))
|
|
return -EINVAL;
|
|
|
|
mlog(0, "got DATA DONE: dead_node=%u, reco.dead_node=%u, "
|
|
"node_idx=%u, this node=%u\n", done->dead_node,
|
|
dlm->reco.dead_node, done->node_idx, dlm->node_num);
|
|
|
|
mlog_bug_on_msg((done->dead_node != dlm->reco.dead_node),
|
|
"Got DATA DONE: dead_node=%u, reco.dead_node=%u, "
|
|
"node_idx=%u, this node=%u\n", done->dead_node,
|
|
dlm->reco.dead_node, done->node_idx, dlm->node_num);
|
|
|
|
spin_lock(&dlm_reco_state_lock);
|
|
list_for_each_entry(ndata, &dlm->reco.node_data, list) {
|
|
if (ndata->node_num != done->node_idx)
|
|
continue;
|
|
|
|
switch (ndata->state) {
|
|
/* should have moved beyond INIT but not to FINALIZE yet */
|
|
case DLM_RECO_NODE_DATA_INIT:
|
|
case DLM_RECO_NODE_DATA_DEAD:
|
|
case DLM_RECO_NODE_DATA_FINALIZE_SENT:
|
|
mlog(ML_ERROR, "bad ndata state for node %u:"
|
|
" state=%d\n", ndata->node_num,
|
|
ndata->state);
|
|
BUG();
|
|
break;
|
|
/* these states are possible at this point, anywhere along
|
|
* the line of recovery */
|
|
case DLM_RECO_NODE_DATA_DONE:
|
|
case DLM_RECO_NODE_DATA_RECEIVING:
|
|
case DLM_RECO_NODE_DATA_REQUESTED:
|
|
case DLM_RECO_NODE_DATA_REQUESTING:
|
|
mlog(0, "node %u is DONE sending "
|
|
"recovery data!\n",
|
|
ndata->node_num);
|
|
|
|
ndata->state = DLM_RECO_NODE_DATA_DONE;
|
|
ret = 0;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&dlm_reco_state_lock);
|
|
|
|
/* wake the recovery thread, some node is done */
|
|
if (!ret)
|
|
dlm_kick_recovery_thread(dlm);
|
|
|
|
if (ret < 0)
|
|
mlog(ML_ERROR, "failed to find recovery node data for node "
|
|
"%u\n", done->node_idx);
|
|
dlm_put(dlm);
|
|
|
|
mlog(0, "leaving reco data done handler, ret=%d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
static void dlm_move_reco_locks_to_list(struct dlm_ctxt *dlm,
|
|
struct list_head *list,
|
|
u8 dead_node)
|
|
{
|
|
struct dlm_lock_resource *res, *next;
|
|
struct dlm_lock *lock;
|
|
|
|
spin_lock(&dlm->spinlock);
|
|
list_for_each_entry_safe(res, next, &dlm->reco.resources, recovering) {
|
|
/* always prune any $RECOVERY entries for dead nodes,
|
|
* otherwise hangs can occur during later recovery */
|
|
if (dlm_is_recovery_lock(res->lockname.name,
|
|
res->lockname.len)) {
|
|
spin_lock(&res->spinlock);
|
|
list_for_each_entry(lock, &res->granted, list) {
|
|
if (lock->ml.node == dead_node) {
|
|
mlog(0, "AHA! there was "
|
|
"a $RECOVERY lock for dead "
|
|
"node %u (%s)!\n",
|
|
dead_node, dlm->name);
|
|
list_del_init(&lock->list);
|
|
dlm_lock_put(lock);
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&res->spinlock);
|
|
continue;
|
|
}
|
|
|
|
if (res->owner == dead_node) {
|
|
mlog(0, "found lockres owned by dead node while "
|
|
"doing recovery for node %u. sending it.\n",
|
|
dead_node);
|
|
list_move_tail(&res->recovering, list);
|
|
} else if (res->owner == DLM_LOCK_RES_OWNER_UNKNOWN) {
|
|
mlog(0, "found UNKNOWN owner while doing recovery "
|
|
"for node %u. sending it.\n", dead_node);
|
|
list_move_tail(&res->recovering, list);
|
|
}
|
|
}
|
|
spin_unlock(&dlm->spinlock);
|
|
}
|
|
|
|
static inline int dlm_num_locks_in_lockres(struct dlm_lock_resource *res)
|
|
{
|
|
int total_locks = 0;
|
|
struct list_head *iter, *queue = &res->granted;
|
|
int i;
|
|
|
|
for (i=0; i<3; i++) {
|
|
list_for_each(iter, queue)
|
|
total_locks++;
|
|
queue++;
|
|
}
|
|
return total_locks;
|
|
}
|
|
|
|
|
|
static int dlm_send_mig_lockres_msg(struct dlm_ctxt *dlm,
|
|
struct dlm_migratable_lockres *mres,
|
|
u8 send_to,
|
|
struct dlm_lock_resource *res,
|
|
int total_locks)
|
|
{
|
|
u64 mig_cookie = be64_to_cpu(mres->mig_cookie);
|
|
int mres_total_locks = be32_to_cpu(mres->total_locks);
|
|
int sz, ret = 0, status = 0;
|
|
u8 orig_flags = mres->flags,
|
|
orig_master = mres->master;
|
|
|
|
BUG_ON(mres->num_locks > DLM_MAX_MIGRATABLE_LOCKS);
|
|
if (!mres->num_locks)
|
|
return 0;
|
|
|
|
sz = sizeof(struct dlm_migratable_lockres) +
|
|
(mres->num_locks * sizeof(struct dlm_migratable_lock));
|
|
|
|
/* add an all-done flag if we reached the last lock */
|
|
orig_flags = mres->flags;
|
|
BUG_ON(total_locks > mres_total_locks);
|
|
if (total_locks == mres_total_locks)
|
|
mres->flags |= DLM_MRES_ALL_DONE;
|
|
|
|
mlog(0, "%s:%.*s: sending mig lockres (%s) to %u\n",
|
|
dlm->name, res->lockname.len, res->lockname.name,
|
|
orig_flags & DLM_MRES_MIGRATION ? "migration" : "recovery",
|
|
send_to);
|
|
|
|
/* send it */
|
|
ret = o2net_send_message(DLM_MIG_LOCKRES_MSG, dlm->key, mres,
|
|
sz, send_to, &status);
|
|
if (ret < 0) {
|
|
/* XXX: negative status is not handled.
|
|
* this will end up killing this node. */
|
|
mlog(ML_ERROR, "%s: res %.*s, Error %d send MIG_LOCKRES to "
|
|
"node %u (%s)\n", dlm->name, mres->lockname_len,
|
|
mres->lockname, ret, send_to,
|
|
(orig_flags & DLM_MRES_MIGRATION ?
|
|
"migration" : "recovery"));
|
|
} else {
|
|
/* might get an -ENOMEM back here */
|
|
ret = status;
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
|
|
if (ret == -EFAULT) {
|
|
mlog(ML_ERROR, "node %u told me to kill "
|
|
"myself!\n", send_to);
|
|
BUG();
|
|
}
|
|
}
|
|
}
|
|
|
|
/* zero and reinit the message buffer */
|
|
dlm_init_migratable_lockres(mres, res->lockname.name,
|
|
res->lockname.len, mres_total_locks,
|
|
mig_cookie, orig_flags, orig_master);
|
|
return ret;
|
|
}
|
|
|
|
static void dlm_init_migratable_lockres(struct dlm_migratable_lockres *mres,
|
|
const char *lockname, int namelen,
|
|
int total_locks, u64 cookie,
|
|
u8 flags, u8 master)
|
|
{
|
|
/* mres here is one full page */
|
|
clear_page(mres);
|
|
mres->lockname_len = namelen;
|
|
memcpy(mres->lockname, lockname, namelen);
|
|
mres->num_locks = 0;
|
|
mres->total_locks = cpu_to_be32(total_locks);
|
|
mres->mig_cookie = cpu_to_be64(cookie);
|
|
mres->flags = flags;
|
|
mres->master = master;
|
|
}
|
|
|
|
static void dlm_prepare_lvb_for_migration(struct dlm_lock *lock,
|
|
struct dlm_migratable_lockres *mres,
|
|
int queue)
|
|
{
|
|
if (!lock->lksb)
|
|
return;
|
|
|
|
/* Ignore lvb in all locks in the blocked list */
|
|
if (queue == DLM_BLOCKED_LIST)
|
|
return;
|
|
|
|
/* Only consider lvbs in locks with granted EX or PR lock levels */
|
|
if (lock->ml.type != LKM_EXMODE && lock->ml.type != LKM_PRMODE)
|
|
return;
|
|
|
|
if (dlm_lvb_is_empty(mres->lvb)) {
|
|
memcpy(mres->lvb, lock->lksb->lvb, DLM_LVB_LEN);
|
|
return;
|
|
}
|
|
|
|
/* Ensure the lvb copied for migration matches in other valid locks */
|
|
if (!memcmp(mres->lvb, lock->lksb->lvb, DLM_LVB_LEN))
|
|
return;
|
|
|
|
mlog(ML_ERROR, "Mismatched lvb in lock cookie=%u:%llu, name=%.*s, "
|
|
"node=%u\n",
|
|
dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
|
|
dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
|
|
lock->lockres->lockname.len, lock->lockres->lockname.name,
|
|
lock->ml.node);
|
|
dlm_print_one_lock_resource(lock->lockres);
|
|
BUG();
|
|
}
|
|
|
|
/* returns 1 if this lock fills the network structure,
|
|
* 0 otherwise */
|
|
static int dlm_add_lock_to_array(struct dlm_lock *lock,
|
|
struct dlm_migratable_lockres *mres, int queue)
|
|
{
|
|
struct dlm_migratable_lock *ml;
|
|
int lock_num = mres->num_locks;
|
|
|
|
ml = &(mres->ml[lock_num]);
|
|
ml->cookie = lock->ml.cookie;
|
|
ml->type = lock->ml.type;
|
|
ml->convert_type = lock->ml.convert_type;
|
|
ml->highest_blocked = lock->ml.highest_blocked;
|
|
ml->list = queue;
|
|
if (lock->lksb) {
|
|
ml->flags = lock->lksb->flags;
|
|
dlm_prepare_lvb_for_migration(lock, mres, queue);
|
|
}
|
|
ml->node = lock->ml.node;
|
|
mres->num_locks++;
|
|
/* we reached the max, send this network message */
|
|
if (mres->num_locks == DLM_MAX_MIGRATABLE_LOCKS)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static void dlm_add_dummy_lock(struct dlm_ctxt *dlm,
|
|
struct dlm_migratable_lockres *mres)
|
|
{
|
|
struct dlm_lock dummy;
|
|
memset(&dummy, 0, sizeof(dummy));
|
|
dummy.ml.cookie = 0;
|
|
dummy.ml.type = LKM_IVMODE;
|
|
dummy.ml.convert_type = LKM_IVMODE;
|
|
dummy.ml.highest_blocked = LKM_IVMODE;
|
|
dummy.lksb = NULL;
|
|
dummy.ml.node = dlm->node_num;
|
|
dlm_add_lock_to_array(&dummy, mres, DLM_BLOCKED_LIST);
|
|
}
|
|
|
|
static inline int dlm_is_dummy_lock(struct dlm_ctxt *dlm,
|
|
struct dlm_migratable_lock *ml,
|
|
u8 *nodenum)
|
|
{
|
|
if (unlikely(ml->cookie == 0 &&
|
|
ml->type == LKM_IVMODE &&
|
|
ml->convert_type == LKM_IVMODE &&
|
|
ml->highest_blocked == LKM_IVMODE &&
|
|
ml->list == DLM_BLOCKED_LIST)) {
|
|
*nodenum = ml->node;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int dlm_send_one_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
|
|
struct dlm_migratable_lockres *mres,
|
|
u8 send_to, u8 flags)
|
|
{
|
|
struct list_head *queue;
|
|
int total_locks, i;
|
|
u64 mig_cookie = 0;
|
|
struct dlm_lock *lock;
|
|
int ret = 0;
|
|
|
|
BUG_ON(!(flags & (DLM_MRES_RECOVERY|DLM_MRES_MIGRATION)));
|
|
|
|
mlog(0, "sending to %u\n", send_to);
|
|
|
|
total_locks = dlm_num_locks_in_lockres(res);
|
|
if (total_locks > DLM_MAX_MIGRATABLE_LOCKS) {
|
|
/* rare, but possible */
|
|
mlog(0, "argh. lockres has %d locks. this will "
|
|
"require more than one network packet to "
|
|
"migrate\n", total_locks);
|
|
mig_cookie = dlm_get_next_mig_cookie();
|
|
}
|
|
|
|
dlm_init_migratable_lockres(mres, res->lockname.name,
|
|
res->lockname.len, total_locks,
|
|
mig_cookie, flags, res->owner);
|
|
|
|
total_locks = 0;
|
|
for (i=DLM_GRANTED_LIST; i<=DLM_BLOCKED_LIST; i++) {
|
|
queue = dlm_list_idx_to_ptr(res, i);
|
|
list_for_each_entry(lock, queue, list) {
|
|
/* add another lock. */
|
|
total_locks++;
|
|
if (!dlm_add_lock_to_array(lock, mres, i))
|
|
continue;
|
|
|
|
/* this filled the lock message,
|
|
* we must send it immediately. */
|
|
ret = dlm_send_mig_lockres_msg(dlm, mres, send_to,
|
|
res, total_locks);
|
|
if (ret < 0)
|
|
goto error;
|
|
}
|
|
}
|
|
if (total_locks == 0) {
|
|
/* send a dummy lock to indicate a mastery reference only */
|
|
mlog(0, "%s:%.*s: sending dummy lock to %u, %s\n",
|
|
dlm->name, res->lockname.len, res->lockname.name,
|
|
send_to, flags & DLM_MRES_RECOVERY ? "recovery" :
|
|
"migration");
|
|
dlm_add_dummy_lock(dlm, mres);
|
|
}
|
|
/* flush any remaining locks */
|
|
ret = dlm_send_mig_lockres_msg(dlm, mres, send_to, res, total_locks);
|
|
if (ret < 0)
|
|
goto error;
|
|
return ret;
|
|
|
|
error:
|
|
mlog(ML_ERROR, "%s: dlm_send_mig_lockres_msg returned %d\n",
|
|
dlm->name, ret);
|
|
if (!dlm_is_host_down(ret))
|
|
BUG();
|
|
mlog(0, "%s: node %u went down while sending %s "
|
|
"lockres %.*s\n", dlm->name, send_to,
|
|
flags & DLM_MRES_RECOVERY ? "recovery" : "migration",
|
|
res->lockname.len, res->lockname.name);
|
|
return ret;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* this message will contain no more than one page worth of
|
|
* recovery data, and it will work on only one lockres.
|
|
* there may be many locks in this page, and we may need to wait
|
|
* for additional packets to complete all the locks (rare, but
|
|
* possible).
|
|
*/
|
|
/*
|
|
* NOTE: the allocation error cases here are scary
|
|
* we really cannot afford to fail an alloc in recovery
|
|
* do we spin? returning an error only delays the problem really
|
|
*/
|
|
|
|
int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data,
|
|
void **ret_data)
|
|
{
|
|
struct dlm_ctxt *dlm = data;
|
|
struct dlm_migratable_lockres *mres =
|
|
(struct dlm_migratable_lockres *)msg->buf;
|
|
int ret = 0;
|
|
u8 real_master;
|
|
u8 extra_refs = 0;
|
|
char *buf = NULL;
|
|
struct dlm_work_item *item = NULL;
|
|
struct dlm_lock_resource *res = NULL;
|
|
|
|
if (!dlm_grab(dlm))
|
|
return -EINVAL;
|
|
|
|
BUG_ON(!(mres->flags & (DLM_MRES_RECOVERY|DLM_MRES_MIGRATION)));
|
|
|
|
real_master = mres->master;
|
|
if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) {
|
|
/* cannot migrate a lockres with no master */
|
|
BUG_ON(!(mres->flags & DLM_MRES_RECOVERY));
|
|
}
|
|
|
|
mlog(0, "%s message received from node %u\n",
|
|
(mres->flags & DLM_MRES_RECOVERY) ?
|
|
"recovery" : "migration", mres->master);
|
|
if (mres->flags & DLM_MRES_ALL_DONE)
|
|
mlog(0, "all done flag. all lockres data received!\n");
|
|
|
|
ret = -ENOMEM;
|
|
buf = kmalloc(be16_to_cpu(msg->data_len), GFP_NOFS);
|
|
item = kzalloc(sizeof(*item), GFP_NOFS);
|
|
if (!buf || !item)
|
|
goto leave;
|
|
|
|
/* lookup the lock to see if we have a secondary queue for this
|
|
* already... just add the locks in and this will have its owner
|
|
* and RECOVERY flag changed when it completes. */
|
|
res = dlm_lookup_lockres(dlm, mres->lockname, mres->lockname_len);
|
|
if (res) {
|
|
/* this will get a ref on res */
|
|
/* mark it as recovering/migrating and hash it */
|
|
spin_lock(&res->spinlock);
|
|
if (mres->flags & DLM_MRES_RECOVERY) {
|
|
res->state |= DLM_LOCK_RES_RECOVERING;
|
|
} else {
|
|
if (res->state & DLM_LOCK_RES_MIGRATING) {
|
|
/* this is at least the second
|
|
* lockres message */
|
|
mlog(0, "lock %.*s is already migrating\n",
|
|
mres->lockname_len,
|
|
mres->lockname);
|
|
} else if (res->state & DLM_LOCK_RES_RECOVERING) {
|
|
/* caller should BUG */
|
|
mlog(ML_ERROR, "node is attempting to migrate "
|
|
"lock %.*s, but marked as recovering!\n",
|
|
mres->lockname_len, mres->lockname);
|
|
ret = -EFAULT;
|
|
spin_unlock(&res->spinlock);
|
|
goto leave;
|
|
}
|
|
res->state |= DLM_LOCK_RES_MIGRATING;
|
|
}
|
|
spin_unlock(&res->spinlock);
|
|
} else {
|
|
/* need to allocate, just like if it was
|
|
* mastered here normally */
|
|
res = dlm_new_lockres(dlm, mres->lockname, mres->lockname_len);
|
|
if (!res)
|
|
goto leave;
|
|
|
|
/* to match the ref that we would have gotten if
|
|
* dlm_lookup_lockres had succeeded */
|
|
dlm_lockres_get(res);
|
|
|
|
/* mark it as recovering/migrating and hash it */
|
|
if (mres->flags & DLM_MRES_RECOVERY)
|
|
res->state |= DLM_LOCK_RES_RECOVERING;
|
|
else
|
|
res->state |= DLM_LOCK_RES_MIGRATING;
|
|
|
|
spin_lock(&dlm->spinlock);
|
|
__dlm_insert_lockres(dlm, res);
|
|
spin_unlock(&dlm->spinlock);
|
|
|
|
/* Add an extra ref for this lock-less lockres lest the
|
|
* dlm_thread purges it before we get the chance to add
|
|
* locks to it */
|
|
dlm_lockres_get(res);
|
|
|
|
/* There are three refs that need to be put.
|
|
* 1. Taken above.
|
|
* 2. kref_init in dlm_new_lockres()->dlm_init_lockres().
|
|
* 3. dlm_lookup_lockres()
|
|
* The first one is handled at the end of this function. The
|
|
* other two are handled in the worker thread after locks have
|
|
* been attached. Yes, we don't wait for purge time to match
|
|
* kref_init. The lockres will still have atleast one ref
|
|
* added because it is in the hash __dlm_insert_lockres() */
|
|
extra_refs++;
|
|
|
|
/* now that the new lockres is inserted,
|
|
* make it usable by other processes */
|
|
spin_lock(&res->spinlock);
|
|
res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
|
|
spin_unlock(&res->spinlock);
|
|
wake_up(&res->wq);
|
|
}
|
|
|
|
/* at this point we have allocated everything we need,
|
|
* and we have a hashed lockres with an extra ref and
|
|
* the proper res->state flags. */
|
|
ret = 0;
|
|
spin_lock(&res->spinlock);
|
|
/* drop this either when master requery finds a different master
|
|
* or when a lock is added by the recovery worker */
|
|
dlm_lockres_grab_inflight_ref(dlm, res);
|
|
if (mres->master == DLM_LOCK_RES_OWNER_UNKNOWN) {
|
|
/* migration cannot have an unknown master */
|
|
BUG_ON(!(mres->flags & DLM_MRES_RECOVERY));
|
|
mlog(0, "recovery has passed me a lockres with an "
|
|
"unknown owner.. will need to requery: "
|
|
"%.*s\n", mres->lockname_len, mres->lockname);
|
|
} else {
|
|
/* take a reference now to pin the lockres, drop it
|
|
* when locks are added in the worker */
|
|
dlm_change_lockres_owner(dlm, res, dlm->node_num);
|
|
}
|
|
spin_unlock(&res->spinlock);
|
|
|
|
/* queue up work for dlm_mig_lockres_worker */
|
|
dlm_grab(dlm); /* get an extra ref for the work item */
|
|
memcpy(buf, msg->buf, be16_to_cpu(msg->data_len)); /* copy the whole message */
|
|
dlm_init_work_item(dlm, item, dlm_mig_lockres_worker, buf);
|
|
item->u.ml.lockres = res; /* already have a ref */
|
|
item->u.ml.real_master = real_master;
|
|
item->u.ml.extra_ref = extra_refs;
|
|
spin_lock(&dlm->work_lock);
|
|
list_add_tail(&item->list, &dlm->work_list);
|
|
spin_unlock(&dlm->work_lock);
|
|
queue_work(dlm->dlm_worker, &dlm->dispatched_work);
|
|
|
|
leave:
|
|
/* One extra ref taken needs to be put here */
|
|
if (extra_refs)
|
|
dlm_lockres_put(res);
|
|
|
|
dlm_put(dlm);
|
|
if (ret < 0) {
|
|
if (buf)
|
|
kfree(buf);
|
|
if (item)
|
|
kfree(item);
|
|
mlog_errno(ret);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
static void dlm_mig_lockres_worker(struct dlm_work_item *item, void *data)
|
|
{
|
|
struct dlm_ctxt *dlm;
|
|
struct dlm_migratable_lockres *mres;
|
|
int ret = 0;
|
|
struct dlm_lock_resource *res;
|
|
u8 real_master;
|
|
u8 extra_ref;
|
|
|
|
dlm = item->dlm;
|
|
mres = (struct dlm_migratable_lockres *)data;
|
|
|
|
res = item->u.ml.lockres;
|
|
real_master = item->u.ml.real_master;
|
|
extra_ref = item->u.ml.extra_ref;
|
|
|
|
if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) {
|
|
/* this case is super-rare. only occurs if
|
|
* node death happens during migration. */
|
|
again:
|
|
ret = dlm_lockres_master_requery(dlm, res, &real_master);
|
|
if (ret < 0) {
|
|
mlog(0, "dlm_lockres_master_requery ret=%d\n",
|
|
ret);
|
|
goto again;
|
|
}
|
|
if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) {
|
|
mlog(0, "lockres %.*s not claimed. "
|
|
"this node will take it.\n",
|
|
res->lockname.len, res->lockname.name);
|
|
} else {
|
|
spin_lock(&res->spinlock);
|
|
dlm_lockres_drop_inflight_ref(dlm, res);
|
|
spin_unlock(&res->spinlock);
|
|
mlog(0, "master needs to respond to sender "
|
|
"that node %u still owns %.*s\n",
|
|
real_master, res->lockname.len,
|
|
res->lockname.name);
|
|
/* cannot touch this lockres */
|
|
goto leave;
|
|
}
|
|
}
|
|
|
|
ret = dlm_process_recovery_data(dlm, res, mres);
|
|
if (ret < 0)
|
|
mlog(0, "dlm_process_recovery_data returned %d\n", ret);
|
|
else
|
|
mlog(0, "dlm_process_recovery_data succeeded\n");
|
|
|
|
if ((mres->flags & (DLM_MRES_MIGRATION|DLM_MRES_ALL_DONE)) ==
|
|
(DLM_MRES_MIGRATION|DLM_MRES_ALL_DONE)) {
|
|
ret = dlm_finish_migration(dlm, res, mres->master);
|
|
if (ret < 0)
|
|
mlog_errno(ret);
|
|
}
|
|
|
|
leave:
|
|
/* See comment in dlm_mig_lockres_handler() */
|
|
if (res) {
|
|
if (extra_ref)
|
|
dlm_lockres_put(res);
|
|
dlm_lockres_put(res);
|
|
}
|
|
kfree(data);
|
|
}
|
|
|
|
|
|
|
|
static int dlm_lockres_master_requery(struct dlm_ctxt *dlm,
|
|
struct dlm_lock_resource *res,
|
|
u8 *real_master)
|
|
{
|
|
struct dlm_node_iter iter;
|
|
int nodenum;
|
|
int ret = 0;
|
|
|
|
*real_master = DLM_LOCK_RES_OWNER_UNKNOWN;
|
|
|
|
/* we only reach here if one of the two nodes in a
|
|
* migration died while the migration was in progress.
|
|
* at this point we need to requery the master. we
|
|
* know that the new_master got as far as creating
|
|
* an mle on at least one node, but we do not know
|
|
* if any nodes had actually cleared the mle and set
|
|
* the master to the new_master. the old master
|
|
* is supposed to set the owner to UNKNOWN in the
|
|
* event of a new_master death, so the only possible
|
|
* responses that we can get from nodes here are
|
|
* that the master is new_master, or that the master
|
|
* is UNKNOWN.
|
|
* if all nodes come back with UNKNOWN then we know
|
|
* the lock needs remastering here.
|
|
* if any node comes back with a valid master, check
|
|
* to see if that master is the one that we are
|
|
* recovering. if so, then the new_master died and
|
|
* we need to remaster this lock. if not, then the
|
|
* new_master survived and that node will respond to
|
|
* other nodes about the owner.
|
|
* if there is an owner, this node needs to dump this
|
|
* lockres and alert the sender that this lockres
|
|
* was rejected. */
|
|
spin_lock(&dlm->spinlock);
|
|
dlm_node_iter_init(dlm->domain_map, &iter);
|
|
spin_unlock(&dlm->spinlock);
|
|
|
|
while ((nodenum = dlm_node_iter_next(&iter)) >= 0) {
|
|
/* do not send to self */
|
|
if (nodenum == dlm->node_num)
|
|
continue;
|
|
ret = dlm_do_master_requery(dlm, res, nodenum, real_master);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
if (!dlm_is_host_down(ret))
|
|
BUG();
|
|
/* host is down, so answer for that node would be
|
|
* DLM_LOCK_RES_OWNER_UNKNOWN. continue. */
|
|
}
|
|
if (*real_master != DLM_LOCK_RES_OWNER_UNKNOWN) {
|
|
mlog(0, "lock master is %u\n", *real_master);
|
|
break;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|
|
int dlm_do_master_requery(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
|
|
u8 nodenum, u8 *real_master)
|
|
{
|
|
int ret = -EINVAL;
|
|
struct dlm_master_requery req;
|
|
int status = DLM_LOCK_RES_OWNER_UNKNOWN;
|
|
|
|
memset(&req, 0, sizeof(req));
|
|
req.node_idx = dlm->node_num;
|
|
req.namelen = res->lockname.len;
|
|
memcpy(req.name, res->lockname.name, res->lockname.len);
|
|
|
|
ret = o2net_send_message(DLM_MASTER_REQUERY_MSG, dlm->key,
|
|
&req, sizeof(req), nodenum, &status);
|
|
/* XXX: negative status not handled properly here. */
|
|
if (ret < 0)
|
|
mlog(ML_ERROR, "Error %d when sending message %u (key "
|
|
"0x%x) to node %u\n", ret, DLM_MASTER_REQUERY_MSG,
|
|
dlm->key, nodenum);
|
|
else {
|
|
BUG_ON(status < 0);
|
|
BUG_ON(status > DLM_LOCK_RES_OWNER_UNKNOWN);
|
|
*real_master = (u8) (status & 0xff);
|
|
mlog(0, "node %u responded to master requery with %u\n",
|
|
nodenum, *real_master);
|
|
ret = 0;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|
|
/* this function cannot error, so unless the sending
|
|
* or receiving of the message failed, the owner can
|
|
* be trusted */
|
|
int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data,
|
|
void **ret_data)
|
|
{
|
|
struct dlm_ctxt *dlm = data;
|
|
struct dlm_master_requery *req = (struct dlm_master_requery *)msg->buf;
|
|
struct dlm_lock_resource *res = NULL;
|
|
unsigned int hash;
|
|
int master = DLM_LOCK_RES_OWNER_UNKNOWN;
|
|
u32 flags = DLM_ASSERT_MASTER_REQUERY;
|
|
|
|
if (!dlm_grab(dlm)) {
|
|
/* since the domain has gone away on this
|
|
* node, the proper response is UNKNOWN */
|
|
return master;
|
|
}
|
|
|
|
hash = dlm_lockid_hash(req->name, req->namelen);
|
|
|
|
spin_lock(&dlm->spinlock);
|
|
res = __dlm_lookup_lockres(dlm, req->name, req->namelen, hash);
|
|
if (res) {
|
|
spin_lock(&res->spinlock);
|
|
master = res->owner;
|
|
if (master == dlm->node_num) {
|
|
int ret = dlm_dispatch_assert_master(dlm, res,
|
|
0, 0, flags);
|
|
if (ret < 0) {
|
|
mlog_errno(-ENOMEM);
|
|
/* retry!? */
|
|
BUG();
|
|
}
|
|
} else /* put.. incase we are not the master */
|
|
dlm_lockres_put(res);
|
|
spin_unlock(&res->spinlock);
|
|
}
|
|
spin_unlock(&dlm->spinlock);
|
|
|
|
dlm_put(dlm);
|
|
return master;
|
|
}
|
|
|
|
static inline struct list_head *
|
|
dlm_list_num_to_pointer(struct dlm_lock_resource *res, int list_num)
|
|
{
|
|
struct list_head *ret;
|
|
BUG_ON(list_num < 0);
|
|
BUG_ON(list_num > 2);
|
|
ret = &(res->granted);
|
|
ret += list_num;
|
|
return ret;
|
|
}
|
|
/* TODO: do ast flush business
|
|
* TODO: do MIGRATING and RECOVERING spinning
|
|
*/
|
|
|
|
/*
|
|
* NOTE about in-flight requests during migration:
|
|
*
|
|
* Before attempting the migrate, the master has marked the lockres as
|
|
* MIGRATING and then flushed all of its pending ASTS. So any in-flight
|
|
* requests either got queued before the MIGRATING flag got set, in which
|
|
* case the lock data will reflect the change and a return message is on
|
|
* the way, or the request failed to get in before MIGRATING got set. In
|
|
* this case, the caller will be told to spin and wait for the MIGRATING
|
|
* flag to be dropped, then recheck the master.
|
|
* This holds true for the convert, cancel and unlock cases, and since lvb
|
|
* updates are tied to these same messages, it applies to lvb updates as
|
|
* well. For the lock case, there is no way a lock can be on the master
|
|
* queue and not be on the secondary queue since the lock is always added
|
|
* locally first. This means that the new target node will never be sent
|
|
* a lock that he doesn't already have on the list.
|
|
* In total, this means that the local lock is correct and should not be
|
|
* updated to match the one sent by the master. Any messages sent back
|
|
* from the master before the MIGRATING flag will bring the lock properly
|
|
* up-to-date, and the change will be ordered properly for the waiter.
|
|
* We will *not* attempt to modify the lock underneath the waiter.
|
|
*/
|
|
|
|
static int dlm_process_recovery_data(struct dlm_ctxt *dlm,
|
|
struct dlm_lock_resource *res,
|
|
struct dlm_migratable_lockres *mres)
|
|
{
|
|
struct dlm_migratable_lock *ml;
|
|
struct list_head *queue;
|
|
struct list_head *tmpq = NULL;
|
|
struct dlm_lock *newlock = NULL;
|
|
struct dlm_lockstatus *lksb = NULL;
|
|
int ret = 0;
|
|
int i, j, bad;
|
|
struct dlm_lock *lock = NULL;
|
|
u8 from = O2NM_MAX_NODES;
|
|
unsigned int added = 0;
|
|
__be64 c;
|
|
|
|
mlog(0, "running %d locks for this lockres\n", mres->num_locks);
|
|
for (i=0; i<mres->num_locks; i++) {
|
|
ml = &(mres->ml[i]);
|
|
|
|
if (dlm_is_dummy_lock(dlm, ml, &from)) {
|
|
/* placeholder, just need to set the refmap bit */
|
|
BUG_ON(mres->num_locks != 1);
|
|
mlog(0, "%s:%.*s: dummy lock for %u\n",
|
|
dlm->name, mres->lockname_len, mres->lockname,
|
|
from);
|
|
spin_lock(&res->spinlock);
|
|
dlm_lockres_set_refmap_bit(dlm, res, from);
|
|
spin_unlock(&res->spinlock);
|
|
added++;
|
|
break;
|
|
}
|
|
BUG_ON(ml->highest_blocked != LKM_IVMODE);
|
|
newlock = NULL;
|
|
lksb = NULL;
|
|
|
|
queue = dlm_list_num_to_pointer(res, ml->list);
|
|
tmpq = NULL;
|
|
|
|
/* if the lock is for the local node it needs to
|
|
* be moved to the proper location within the queue.
|
|
* do not allocate a new lock structure. */
|
|
if (ml->node == dlm->node_num) {
|
|
/* MIGRATION ONLY! */
|
|
BUG_ON(!(mres->flags & DLM_MRES_MIGRATION));
|
|
|
|
spin_lock(&res->spinlock);
|
|
for (j = DLM_GRANTED_LIST; j <= DLM_BLOCKED_LIST; j++) {
|
|
tmpq = dlm_list_idx_to_ptr(res, j);
|
|
list_for_each_entry(lock, tmpq, list) {
|
|
if (lock->ml.cookie != ml->cookie)
|
|
lock = NULL;
|
|
else
|
|
break;
|
|
}
|
|
if (lock)
|
|
break;
|
|
}
|
|
|
|
/* lock is always created locally first, and
|
|
* destroyed locally last. it must be on the list */
|
|
if (!lock) {
|
|
c = ml->cookie;
|
|
mlog(ML_ERROR, "Could not find local lock "
|
|
"with cookie %u:%llu, node %u, "
|
|
"list %u, flags 0x%x, type %d, "
|
|
"conv %d, highest blocked %d\n",
|
|
dlm_get_lock_cookie_node(be64_to_cpu(c)),
|
|
dlm_get_lock_cookie_seq(be64_to_cpu(c)),
|
|
ml->node, ml->list, ml->flags, ml->type,
|
|
ml->convert_type, ml->highest_blocked);
|
|
__dlm_print_one_lock_resource(res);
|
|
BUG();
|
|
}
|
|
|
|
if (lock->ml.node != ml->node) {
|
|
c = lock->ml.cookie;
|
|
mlog(ML_ERROR, "Mismatched node# in lock "
|
|
"cookie %u:%llu, name %.*s, node %u\n",
|
|
dlm_get_lock_cookie_node(be64_to_cpu(c)),
|
|
dlm_get_lock_cookie_seq(be64_to_cpu(c)),
|
|
res->lockname.len, res->lockname.name,
|
|
lock->ml.node);
|
|
c = ml->cookie;
|
|
mlog(ML_ERROR, "Migrate lock cookie %u:%llu, "
|
|
"node %u, list %u, flags 0x%x, type %d, "
|
|
"conv %d, highest blocked %d\n",
|
|
dlm_get_lock_cookie_node(be64_to_cpu(c)),
|
|
dlm_get_lock_cookie_seq(be64_to_cpu(c)),
|
|
ml->node, ml->list, ml->flags, ml->type,
|
|
ml->convert_type, ml->highest_blocked);
|
|
__dlm_print_one_lock_resource(res);
|
|
BUG();
|
|
}
|
|
|
|
if (tmpq != queue) {
|
|
c = ml->cookie;
|
|
mlog(0, "Lock cookie %u:%llu was on list %u "
|
|
"instead of list %u for %.*s\n",
|
|
dlm_get_lock_cookie_node(be64_to_cpu(c)),
|
|
dlm_get_lock_cookie_seq(be64_to_cpu(c)),
|
|
j, ml->list, res->lockname.len,
|
|
res->lockname.name);
|
|
__dlm_print_one_lock_resource(res);
|
|
spin_unlock(&res->spinlock);
|
|
continue;
|
|
}
|
|
|
|
/* see NOTE above about why we do not update
|
|
* to match the master here */
|
|
|
|
/* move the lock to its proper place */
|
|
/* do not alter lock refcount. switching lists. */
|
|
list_move_tail(&lock->list, queue);
|
|
spin_unlock(&res->spinlock);
|
|
added++;
|
|
|
|
mlog(0, "just reordered a local lock!\n");
|
|
continue;
|
|
}
|
|
|
|
/* lock is for another node. */
|
|
newlock = dlm_new_lock(ml->type, ml->node,
|
|
be64_to_cpu(ml->cookie), NULL);
|
|
if (!newlock) {
|
|
ret = -ENOMEM;
|
|
goto leave;
|
|
}
|
|
lksb = newlock->lksb;
|
|
dlm_lock_attach_lockres(newlock, res);
|
|
|
|
if (ml->convert_type != LKM_IVMODE) {
|
|
BUG_ON(queue != &res->converting);
|
|
newlock->ml.convert_type = ml->convert_type;
|
|
}
|
|
lksb->flags |= (ml->flags &
|
|
(DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB));
|
|
|
|
if (ml->type == LKM_NLMODE)
|
|
goto skip_lvb;
|
|
|
|
if (!dlm_lvb_is_empty(mres->lvb)) {
|
|
if (lksb->flags & DLM_LKSB_PUT_LVB) {
|
|
/* other node was trying to update
|
|
* lvb when node died. recreate the
|
|
* lksb with the updated lvb. */
|
|
memcpy(lksb->lvb, mres->lvb, DLM_LVB_LEN);
|
|
/* the lock resource lvb update must happen
|
|
* NOW, before the spinlock is dropped.
|
|
* we no longer wait for the AST to update
|
|
* the lvb. */
|
|
memcpy(res->lvb, mres->lvb, DLM_LVB_LEN);
|
|
} else {
|
|
/* otherwise, the node is sending its
|
|
* most recent valid lvb info */
|
|
BUG_ON(ml->type != LKM_EXMODE &&
|
|
ml->type != LKM_PRMODE);
|
|
if (!dlm_lvb_is_empty(res->lvb) &&
|
|
(ml->type == LKM_EXMODE ||
|
|
memcmp(res->lvb, mres->lvb, DLM_LVB_LEN))) {
|
|
int i;
|
|
mlog(ML_ERROR, "%s:%.*s: received bad "
|
|
"lvb! type=%d\n", dlm->name,
|
|
res->lockname.len,
|
|
res->lockname.name, ml->type);
|
|
printk("lockres lvb=[");
|
|
for (i=0; i<DLM_LVB_LEN; i++)
|
|
printk("%02x", res->lvb[i]);
|
|
printk("]\nmigrated lvb=[");
|
|
for (i=0; i<DLM_LVB_LEN; i++)
|
|
printk("%02x", mres->lvb[i]);
|
|
printk("]\n");
|
|
dlm_print_one_lock_resource(res);
|
|
BUG();
|
|
}
|
|
memcpy(res->lvb, mres->lvb, DLM_LVB_LEN);
|
|
}
|
|
}
|
|
skip_lvb:
|
|
|
|
/* NOTE:
|
|
* wrt lock queue ordering and recovery:
|
|
* 1. order of locks on granted queue is
|
|
* meaningless.
|
|
* 2. order of locks on converting queue is
|
|
* LOST with the node death. sorry charlie.
|
|
* 3. order of locks on the blocked queue is
|
|
* also LOST.
|
|
* order of locks does not affect integrity, it
|
|
* just means that a lock request may get pushed
|
|
* back in line as a result of the node death.
|
|
* also note that for a given node the lock order
|
|
* for its secondary queue locks is preserved
|
|
* relative to each other, but clearly *not*
|
|
* preserved relative to locks from other nodes.
|
|
*/
|
|
bad = 0;
|
|
spin_lock(&res->spinlock);
|
|
list_for_each_entry(lock, queue, list) {
|
|
if (lock->ml.cookie == ml->cookie) {
|
|
c = lock->ml.cookie;
|
|
mlog(ML_ERROR, "%s:%.*s: %u:%llu: lock already "
|
|
"exists on this lockres!\n", dlm->name,
|
|
res->lockname.len, res->lockname.name,
|
|
dlm_get_lock_cookie_node(be64_to_cpu(c)),
|
|
dlm_get_lock_cookie_seq(be64_to_cpu(c)));
|
|
|
|
mlog(ML_NOTICE, "sent lock: type=%d, conv=%d, "
|
|
"node=%u, cookie=%u:%llu, queue=%d\n",
|
|
ml->type, ml->convert_type, ml->node,
|
|
dlm_get_lock_cookie_node(be64_to_cpu(ml->cookie)),
|
|
dlm_get_lock_cookie_seq(be64_to_cpu(ml->cookie)),
|
|
ml->list);
|
|
|
|
__dlm_print_one_lock_resource(res);
|
|
bad = 1;
|
|
break;
|
|
}
|
|
}
|
|
if (!bad) {
|
|
dlm_lock_get(newlock);
|
|
list_add_tail(&newlock->list, queue);
|
|
mlog(0, "%s:%.*s: added lock for node %u, "
|
|
"setting refmap bit\n", dlm->name,
|
|
res->lockname.len, res->lockname.name, ml->node);
|
|
dlm_lockres_set_refmap_bit(dlm, res, ml->node);
|
|
added++;
|
|
}
|
|
spin_unlock(&res->spinlock);
|
|
}
|
|
mlog(0, "done running all the locks\n");
|
|
|
|
leave:
|
|
/* balance the ref taken when the work was queued */
|
|
spin_lock(&res->spinlock);
|
|
dlm_lockres_drop_inflight_ref(dlm, res);
|
|
spin_unlock(&res->spinlock);
|
|
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
if (newlock)
|
|
dlm_lock_put(newlock);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm,
|
|
struct dlm_lock_resource *res)
|
|
{
|
|
int i;
|
|
struct list_head *queue;
|
|
struct dlm_lock *lock, *next;
|
|
|
|
assert_spin_locked(&dlm->spinlock);
|
|
assert_spin_locked(&res->spinlock);
|
|
res->state |= DLM_LOCK_RES_RECOVERING;
|
|
if (!list_empty(&res->recovering)) {
|
|
mlog(0,
|
|
"Recovering res %s:%.*s, is already on recovery list!\n",
|
|
dlm->name, res->lockname.len, res->lockname.name);
|
|
list_del_init(&res->recovering);
|
|
dlm_lockres_put(res);
|
|
}
|
|
/* We need to hold a reference while on the recovery list */
|
|
dlm_lockres_get(res);
|
|
list_add_tail(&res->recovering, &dlm->reco.resources);
|
|
|
|
/* find any pending locks and put them back on proper list */
|
|
for (i=DLM_BLOCKED_LIST; i>=DLM_GRANTED_LIST; i--) {
|
|
queue = dlm_list_idx_to_ptr(res, i);
|
|
list_for_each_entry_safe(lock, next, queue, list) {
|
|
dlm_lock_get(lock);
|
|
if (lock->convert_pending) {
|
|
/* move converting lock back to granted */
|
|
BUG_ON(i != DLM_CONVERTING_LIST);
|
|
mlog(0, "node died with convert pending "
|
|
"on %.*s. move back to granted list.\n",
|
|
res->lockname.len, res->lockname.name);
|
|
dlm_revert_pending_convert(res, lock);
|
|
lock->convert_pending = 0;
|
|
} else if (lock->lock_pending) {
|
|
/* remove pending lock requests completely */
|
|
BUG_ON(i != DLM_BLOCKED_LIST);
|
|
mlog(0, "node died with lock pending "
|
|
"on %.*s. remove from blocked list and skip.\n",
|
|
res->lockname.len, res->lockname.name);
|
|
/* lock will be floating until ref in
|
|
* dlmlock_remote is freed after the network
|
|
* call returns. ok for it to not be on any
|
|
* list since no ast can be called
|
|
* (the master is dead). */
|
|
dlm_revert_pending_lock(res, lock);
|
|
lock->lock_pending = 0;
|
|
} else if (lock->unlock_pending) {
|
|
/* if an unlock was in progress, treat as
|
|
* if this had completed successfully
|
|
* before sending this lock state to the
|
|
* new master. note that the dlm_unlock
|
|
* call is still responsible for calling
|
|
* the unlockast. that will happen after
|
|
* the network call times out. for now,
|
|
* just move lists to prepare the new
|
|
* recovery master. */
|
|
BUG_ON(i != DLM_GRANTED_LIST);
|
|
mlog(0, "node died with unlock pending "
|
|
"on %.*s. remove from blocked list and skip.\n",
|
|
res->lockname.len, res->lockname.name);
|
|
dlm_commit_pending_unlock(res, lock);
|
|
lock->unlock_pending = 0;
|
|
} else if (lock->cancel_pending) {
|
|
/* if a cancel was in progress, treat as
|
|
* if this had completed successfully
|
|
* before sending this lock state to the
|
|
* new master */
|
|
BUG_ON(i != DLM_CONVERTING_LIST);
|
|
mlog(0, "node died with cancel pending "
|
|
"on %.*s. move back to granted list.\n",
|
|
res->lockname.len, res->lockname.name);
|
|
dlm_commit_pending_cancel(res, lock);
|
|
lock->cancel_pending = 0;
|
|
}
|
|
dlm_lock_put(lock);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/* removes all recovered locks from the recovery list.
|
|
* sets the res->owner to the new master.
|
|
* unsets the RECOVERY flag and wakes waiters. */
|
|
static void dlm_finish_local_lockres_recovery(struct dlm_ctxt *dlm,
|
|
u8 dead_node, u8 new_master)
|
|
{
|
|
int i;
|
|
struct hlist_node *hash_iter;
|
|
struct hlist_head *bucket;
|
|
struct dlm_lock_resource *res, *next;
|
|
|
|
assert_spin_locked(&dlm->spinlock);
|
|
|
|
list_for_each_entry_safe(res, next, &dlm->reco.resources, recovering) {
|
|
if (res->owner == dead_node) {
|
|
mlog(0, "%s: res %.*s, Changing owner from %u to %u\n",
|
|
dlm->name, res->lockname.len, res->lockname.name,
|
|
res->owner, new_master);
|
|
list_del_init(&res->recovering);
|
|
spin_lock(&res->spinlock);
|
|
/* new_master has our reference from
|
|
* the lock state sent during recovery */
|
|
dlm_change_lockres_owner(dlm, res, new_master);
|
|
res->state &= ~DLM_LOCK_RES_RECOVERING;
|
|
if (__dlm_lockres_has_locks(res))
|
|
__dlm_dirty_lockres(dlm, res);
|
|
spin_unlock(&res->spinlock);
|
|
wake_up(&res->wq);
|
|
dlm_lockres_put(res);
|
|
}
|
|
}
|
|
|
|
/* this will become unnecessary eventually, but
|
|
* for now we need to run the whole hash, clear
|
|
* the RECOVERING state and set the owner
|
|
* if necessary */
|
|
for (i = 0; i < DLM_HASH_BUCKETS; i++) {
|
|
bucket = dlm_lockres_hash(dlm, i);
|
|
hlist_for_each_entry(res, hash_iter, bucket, hash_node) {
|
|
if (!(res->state & DLM_LOCK_RES_RECOVERING))
|
|
continue;
|
|
|
|
if (res->owner != dead_node &&
|
|
res->owner != dlm->node_num)
|
|
continue;
|
|
|
|
if (!list_empty(&res->recovering)) {
|
|
list_del_init(&res->recovering);
|
|
dlm_lockres_put(res);
|
|
}
|
|
|
|
/* new_master has our reference from
|
|
* the lock state sent during recovery */
|
|
mlog(0, "%s: res %.*s, Changing owner from %u to %u\n",
|
|
dlm->name, res->lockname.len, res->lockname.name,
|
|
res->owner, new_master);
|
|
spin_lock(&res->spinlock);
|
|
dlm_change_lockres_owner(dlm, res, new_master);
|
|
res->state &= ~DLM_LOCK_RES_RECOVERING;
|
|
if (__dlm_lockres_has_locks(res))
|
|
__dlm_dirty_lockres(dlm, res);
|
|
spin_unlock(&res->spinlock);
|
|
wake_up(&res->wq);
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline int dlm_lvb_needs_invalidation(struct dlm_lock *lock, int local)
|
|
{
|
|
if (local) {
|
|
if (lock->ml.type != LKM_EXMODE &&
|
|
lock->ml.type != LKM_PRMODE)
|
|
return 1;
|
|
} else if (lock->ml.type == LKM_EXMODE)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static void dlm_revalidate_lvb(struct dlm_ctxt *dlm,
|
|
struct dlm_lock_resource *res, u8 dead_node)
|
|
{
|
|
struct list_head *queue;
|
|
struct dlm_lock *lock;
|
|
int blank_lvb = 0, local = 0;
|
|
int i;
|
|
u8 search_node;
|
|
|
|
assert_spin_locked(&dlm->spinlock);
|
|
assert_spin_locked(&res->spinlock);
|
|
|
|
if (res->owner == dlm->node_num)
|
|
/* if this node owned the lockres, and if the dead node
|
|
* had an EX when he died, blank out the lvb */
|
|
search_node = dead_node;
|
|
else {
|
|
/* if this is a secondary lockres, and we had no EX or PR
|
|
* locks granted, we can no longer trust the lvb */
|
|
search_node = dlm->node_num;
|
|
local = 1; /* check local state for valid lvb */
|
|
}
|
|
|
|
for (i=DLM_GRANTED_LIST; i<=DLM_CONVERTING_LIST; i++) {
|
|
queue = dlm_list_idx_to_ptr(res, i);
|
|
list_for_each_entry(lock, queue, list) {
|
|
if (lock->ml.node == search_node) {
|
|
if (dlm_lvb_needs_invalidation(lock, local)) {
|
|
/* zero the lksb lvb and lockres lvb */
|
|
blank_lvb = 1;
|
|
memset(lock->lksb->lvb, 0, DLM_LVB_LEN);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (blank_lvb) {
|
|
mlog(0, "clearing %.*s lvb, dead node %u had EX\n",
|
|
res->lockname.len, res->lockname.name, dead_node);
|
|
memset(res->lvb, 0, DLM_LVB_LEN);
|
|
}
|
|
}
|
|
|
|
static void dlm_free_dead_locks(struct dlm_ctxt *dlm,
|
|
struct dlm_lock_resource *res, u8 dead_node)
|
|
{
|
|
struct dlm_lock *lock, *next;
|
|
unsigned int freed = 0;
|
|
|
|
/* this node is the lockres master:
|
|
* 1) remove any stale locks for the dead node
|
|
* 2) if the dead node had an EX when he died, blank out the lvb
|
|
*/
|
|
assert_spin_locked(&dlm->spinlock);
|
|
assert_spin_locked(&res->spinlock);
|
|
|
|
/* We do two dlm_lock_put(). One for removing from list and the other is
|
|
* to force the DLM_UNLOCK_FREE_LOCK action so as to free the locks */
|
|
|
|
/* TODO: check pending_asts, pending_basts here */
|
|
list_for_each_entry_safe(lock, next, &res->granted, list) {
|
|
if (lock->ml.node == dead_node) {
|
|
list_del_init(&lock->list);
|
|
dlm_lock_put(lock);
|
|
/* Can't schedule DLM_UNLOCK_FREE_LOCK - do manually */
|
|
dlm_lock_put(lock);
|
|
freed++;
|
|
}
|
|
}
|
|
list_for_each_entry_safe(lock, next, &res->converting, list) {
|
|
if (lock->ml.node == dead_node) {
|
|
list_del_init(&lock->list);
|
|
dlm_lock_put(lock);
|
|
/* Can't schedule DLM_UNLOCK_FREE_LOCK - do manually */
|
|
dlm_lock_put(lock);
|
|
freed++;
|
|
}
|
|
}
|
|
list_for_each_entry_safe(lock, next, &res->blocked, list) {
|
|
if (lock->ml.node == dead_node) {
|
|
list_del_init(&lock->list);
|
|
dlm_lock_put(lock);
|
|
/* Can't schedule DLM_UNLOCK_FREE_LOCK - do manually */
|
|
dlm_lock_put(lock);
|
|
freed++;
|
|
}
|
|
}
|
|
|
|
if (freed) {
|
|
mlog(0, "%s:%.*s: freed %u locks for dead node %u, "
|
|
"dropping ref from lockres\n", dlm->name,
|
|
res->lockname.len, res->lockname.name, freed, dead_node);
|
|
if(!test_bit(dead_node, res->refmap)) {
|
|
mlog(ML_ERROR, "%s:%.*s: freed %u locks for dead node %u, "
|
|
"but ref was not set\n", dlm->name,
|
|
res->lockname.len, res->lockname.name, freed, dead_node);
|
|
__dlm_print_one_lock_resource(res);
|
|
}
|
|
dlm_lockres_clear_refmap_bit(dlm, res, dead_node);
|
|
} else if (test_bit(dead_node, res->refmap)) {
|
|
mlog(0, "%s:%.*s: dead node %u had a ref, but had "
|
|
"no locks and had not purged before dying\n", dlm->name,
|
|
res->lockname.len, res->lockname.name, dead_node);
|
|
dlm_lockres_clear_refmap_bit(dlm, res, dead_node);
|
|
}
|
|
|
|
/* do not kick thread yet */
|
|
__dlm_dirty_lockres(dlm, res);
|
|
}
|
|
|
|
/* if this node is the recovery master, and there are no
|
|
* locks for a given lockres owned by this node that are in
|
|
* either PR or EX mode, zero out the lvb before requesting.
|
|
*
|
|
*/
|
|
|
|
|
|
static void dlm_do_local_recovery_cleanup(struct dlm_ctxt *dlm, u8 dead_node)
|
|
{
|
|
struct hlist_node *iter;
|
|
struct dlm_lock_resource *res;
|
|
int i;
|
|
struct hlist_head *bucket;
|
|
struct dlm_lock *lock;
|
|
|
|
|
|
/* purge any stale mles */
|
|
dlm_clean_master_list(dlm, dead_node);
|
|
|
|
/*
|
|
* now clean up all lock resources. there are two rules:
|
|
*
|
|
* 1) if the dead node was the master, move the lockres
|
|
* to the recovering list. set the RECOVERING flag.
|
|
* this lockres needs to be cleaned up before it can
|
|
* be used further.
|
|
*
|
|
* 2) if this node was the master, remove all locks from
|
|
* each of the lockres queues that were owned by the
|
|
* dead node. once recovery finishes, the dlm thread
|
|
* can be kicked again to see if any ASTs or BASTs
|
|
* need to be fired as a result.
|
|
*/
|
|
for (i = 0; i < DLM_HASH_BUCKETS; i++) {
|
|
bucket = dlm_lockres_hash(dlm, i);
|
|
hlist_for_each_entry(res, iter, bucket, hash_node) {
|
|
/* always prune any $RECOVERY entries for dead nodes,
|
|
* otherwise hangs can occur during later recovery */
|
|
if (dlm_is_recovery_lock(res->lockname.name,
|
|
res->lockname.len)) {
|
|
spin_lock(&res->spinlock);
|
|
list_for_each_entry(lock, &res->granted, list) {
|
|
if (lock->ml.node == dead_node) {
|
|
mlog(0, "AHA! there was "
|
|
"a $RECOVERY lock for dead "
|
|
"node %u (%s)!\n",
|
|
dead_node, dlm->name);
|
|
list_del_init(&lock->list);
|
|
dlm_lock_put(lock);
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&res->spinlock);
|
|
continue;
|
|
}
|
|
spin_lock(&res->spinlock);
|
|
/* zero the lvb if necessary */
|
|
dlm_revalidate_lvb(dlm, res, dead_node);
|
|
if (res->owner == dead_node) {
|
|
if (res->state & DLM_LOCK_RES_DROPPING_REF) {
|
|
mlog(ML_NOTICE, "%s: res %.*s, Skip "
|
|
"recovery as it is being freed\n",
|
|
dlm->name, res->lockname.len,
|
|
res->lockname.name);
|
|
} else
|
|
dlm_move_lockres_to_recovery_list(dlm,
|
|
res);
|
|
|
|
} else if (res->owner == dlm->node_num) {
|
|
dlm_free_dead_locks(dlm, res, dead_node);
|
|
__dlm_lockres_calc_usage(dlm, res);
|
|
}
|
|
spin_unlock(&res->spinlock);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
static void __dlm_hb_node_down(struct dlm_ctxt *dlm, int idx)
|
|
{
|
|
assert_spin_locked(&dlm->spinlock);
|
|
|
|
if (dlm->reco.new_master == idx) {
|
|
mlog(0, "%s: recovery master %d just died\n",
|
|
dlm->name, idx);
|
|
if (dlm->reco.state & DLM_RECO_STATE_FINALIZE) {
|
|
/* finalize1 was reached, so it is safe to clear
|
|
* the new_master and dead_node. that recovery
|
|
* is complete. */
|
|
mlog(0, "%s: dead master %d had reached "
|
|
"finalize1 state, clearing\n", dlm->name, idx);
|
|
dlm->reco.state &= ~DLM_RECO_STATE_FINALIZE;
|
|
__dlm_reset_recovery(dlm);
|
|
}
|
|
}
|
|
|
|
/* Clean up join state on node death. */
|
|
if (dlm->joining_node == idx) {
|
|
mlog(0, "Clearing join state for node %u\n", idx);
|
|
__dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
|
|
}
|
|
|
|
/* check to see if the node is already considered dead */
|
|
if (!test_bit(idx, dlm->live_nodes_map)) {
|
|
mlog(0, "for domain %s, node %d is already dead. "
|
|
"another node likely did recovery already.\n",
|
|
dlm->name, idx);
|
|
return;
|
|
}
|
|
|
|
/* check to see if we do not care about this node */
|
|
if (!test_bit(idx, dlm->domain_map)) {
|
|
/* This also catches the case that we get a node down
|
|
* but haven't joined the domain yet. */
|
|
mlog(0, "node %u already removed from domain!\n", idx);
|
|
return;
|
|
}
|
|
|
|
clear_bit(idx, dlm->live_nodes_map);
|
|
|
|
/* make sure local cleanup occurs before the heartbeat events */
|
|
if (!test_bit(idx, dlm->recovery_map))
|
|
dlm_do_local_recovery_cleanup(dlm, idx);
|
|
|
|
/* notify anything attached to the heartbeat events */
|
|
dlm_hb_event_notify_attached(dlm, idx, 0);
|
|
|
|
mlog(0, "node %u being removed from domain map!\n", idx);
|
|
clear_bit(idx, dlm->domain_map);
|
|
clear_bit(idx, dlm->exit_domain_map);
|
|
/* wake up migration waiters if a node goes down.
|
|
* perhaps later we can genericize this for other waiters. */
|
|
wake_up(&dlm->migration_wq);
|
|
|
|
if (test_bit(idx, dlm->recovery_map))
|
|
mlog(0, "domain %s, node %u already added "
|
|
"to recovery map!\n", dlm->name, idx);
|
|
else
|
|
set_bit(idx, dlm->recovery_map);
|
|
}
|
|
|
|
void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data)
|
|
{
|
|
struct dlm_ctxt *dlm = data;
|
|
|
|
if (!dlm_grab(dlm))
|
|
return;
|
|
|
|
/*
|
|
* This will notify any dlm users that a node in our domain
|
|
* went away without notifying us first.
|
|
*/
|
|
if (test_bit(idx, dlm->domain_map))
|
|
dlm_fire_domain_eviction_callbacks(dlm, idx);
|
|
|
|
spin_lock(&dlm->spinlock);
|
|
__dlm_hb_node_down(dlm, idx);
|
|
spin_unlock(&dlm->spinlock);
|
|
|
|
dlm_put(dlm);
|
|
}
|
|
|
|
void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data)
|
|
{
|
|
struct dlm_ctxt *dlm = data;
|
|
|
|
if (!dlm_grab(dlm))
|
|
return;
|
|
|
|
spin_lock(&dlm->spinlock);
|
|
set_bit(idx, dlm->live_nodes_map);
|
|
/* do NOT notify mle attached to the heartbeat events.
|
|
* new nodes are not interesting in mastery until joined. */
|
|
spin_unlock(&dlm->spinlock);
|
|
|
|
dlm_put(dlm);
|
|
}
|
|
|
|
static void dlm_reco_ast(void *astdata)
|
|
{
|
|
struct dlm_ctxt *dlm = astdata;
|
|
mlog(0, "ast for recovery lock fired!, this=%u, dlm=%s\n",
|
|
dlm->node_num, dlm->name);
|
|
}
|
|
static void dlm_reco_bast(void *astdata, int blocked_type)
|
|
{
|
|
struct dlm_ctxt *dlm = astdata;
|
|
mlog(0, "bast for recovery lock fired!, this=%u, dlm=%s\n",
|
|
dlm->node_num, dlm->name);
|
|
}
|
|
static void dlm_reco_unlock_ast(void *astdata, enum dlm_status st)
|
|
{
|
|
mlog(0, "unlockast for recovery lock fired!\n");
|
|
}
|
|
|
|
/*
|
|
* dlm_pick_recovery_master will continually attempt to use
|
|
* dlmlock() on the special "$RECOVERY" lockres with the
|
|
* LKM_NOQUEUE flag to get an EX. every thread that enters
|
|
* this function on each node racing to become the recovery
|
|
* master will not stop attempting this until either:
|
|
* a) this node gets the EX (and becomes the recovery master),
|
|
* or b) dlm->reco.new_master gets set to some nodenum
|
|
* != O2NM_INVALID_NODE_NUM (another node will do the reco).
|
|
* so each time a recovery master is needed, the entire cluster
|
|
* will sync at this point. if the new master dies, that will
|
|
* be detected in dlm_do_recovery */
|
|
static int dlm_pick_recovery_master(struct dlm_ctxt *dlm)
|
|
{
|
|
enum dlm_status ret;
|
|
struct dlm_lockstatus lksb;
|
|
int status = -EINVAL;
|
|
|
|
mlog(0, "starting recovery of %s at %lu, dead=%u, this=%u\n",
|
|
dlm->name, jiffies, dlm->reco.dead_node, dlm->node_num);
|
|
again:
|
|
memset(&lksb, 0, sizeof(lksb));
|
|
|
|
ret = dlmlock(dlm, LKM_EXMODE, &lksb, LKM_NOQUEUE|LKM_RECOVERY,
|
|
DLM_RECOVERY_LOCK_NAME, DLM_RECOVERY_LOCK_NAME_LEN,
|
|
dlm_reco_ast, dlm, dlm_reco_bast);
|
|
|
|
mlog(0, "%s: dlmlock($RECOVERY) returned %d, lksb=%d\n",
|
|
dlm->name, ret, lksb.status);
|
|
|
|
if (ret == DLM_NORMAL) {
|
|
mlog(0, "dlm=%s dlmlock says I got it (this=%u)\n",
|
|
dlm->name, dlm->node_num);
|
|
|
|
/* got the EX lock. check to see if another node
|
|
* just became the reco master */
|
|
if (dlm_reco_master_ready(dlm)) {
|
|
mlog(0, "%s: got reco EX lock, but %u will "
|
|
"do the recovery\n", dlm->name,
|
|
dlm->reco.new_master);
|
|
status = -EEXIST;
|
|
} else {
|
|
status = 0;
|
|
|
|
/* see if recovery was already finished elsewhere */
|
|
spin_lock(&dlm->spinlock);
|
|
if (dlm->reco.dead_node == O2NM_INVALID_NODE_NUM) {
|
|
status = -EINVAL;
|
|
mlog(0, "%s: got reco EX lock, but "
|
|
"node got recovered already\n", dlm->name);
|
|
if (dlm->reco.new_master != O2NM_INVALID_NODE_NUM) {
|
|
mlog(ML_ERROR, "%s: new master is %u "
|
|
"but no dead node!\n",
|
|
dlm->name, dlm->reco.new_master);
|
|
BUG();
|
|
}
|
|
}
|
|
spin_unlock(&dlm->spinlock);
|
|
}
|
|
|
|
/* if this node has actually become the recovery master,
|
|
* set the master and send the messages to begin recovery */
|
|
if (!status) {
|
|
mlog(0, "%s: dead=%u, this=%u, sending "
|
|
"begin_reco now\n", dlm->name,
|
|
dlm->reco.dead_node, dlm->node_num);
|
|
status = dlm_send_begin_reco_message(dlm,
|
|
dlm->reco.dead_node);
|
|
/* this always succeeds */
|
|
BUG_ON(status);
|
|
|
|
/* set the new_master to this node */
|
|
spin_lock(&dlm->spinlock);
|
|
dlm_set_reco_master(dlm, dlm->node_num);
|
|
spin_unlock(&dlm->spinlock);
|
|
}
|
|
|
|
/* recovery lock is a special case. ast will not get fired,
|
|
* so just go ahead and unlock it. */
|
|
ret = dlmunlock(dlm, &lksb, 0, dlm_reco_unlock_ast, dlm);
|
|
if (ret == DLM_DENIED) {
|
|
mlog(0, "got DLM_DENIED, trying LKM_CANCEL\n");
|
|
ret = dlmunlock(dlm, &lksb, LKM_CANCEL, dlm_reco_unlock_ast, dlm);
|
|
}
|
|
if (ret != DLM_NORMAL) {
|
|
/* this would really suck. this could only happen
|
|
* if there was a network error during the unlock
|
|
* because of node death. this means the unlock
|
|
* is actually "done" and the lock structure is
|
|
* even freed. we can continue, but only
|
|
* because this specific lock name is special. */
|
|
mlog(ML_ERROR, "dlmunlock returned %d\n", ret);
|
|
}
|
|
} else if (ret == DLM_NOTQUEUED) {
|
|
mlog(0, "dlm=%s dlmlock says another node got it (this=%u)\n",
|
|
dlm->name, dlm->node_num);
|
|
/* another node is master. wait on
|
|
* reco.new_master != O2NM_INVALID_NODE_NUM
|
|
* for at most one second */
|
|
wait_event_timeout(dlm->dlm_reco_thread_wq,
|
|
dlm_reco_master_ready(dlm),
|
|
msecs_to_jiffies(1000));
|
|
if (!dlm_reco_master_ready(dlm)) {
|
|
mlog(0, "%s: reco master taking awhile\n",
|
|
dlm->name);
|
|
goto again;
|
|
}
|
|
/* another node has informed this one that it is reco master */
|
|
mlog(0, "%s: reco master %u is ready to recover %u\n",
|
|
dlm->name, dlm->reco.new_master, dlm->reco.dead_node);
|
|
status = -EEXIST;
|
|
} else if (ret == DLM_RECOVERING) {
|
|
mlog(0, "dlm=%s dlmlock says master node died (this=%u)\n",
|
|
dlm->name, dlm->node_num);
|
|
goto again;
|
|
} else {
|
|
struct dlm_lock_resource *res;
|
|
|
|
/* dlmlock returned something other than NOTQUEUED or NORMAL */
|
|
mlog(ML_ERROR, "%s: got %s from dlmlock($RECOVERY), "
|
|
"lksb.status=%s\n", dlm->name, dlm_errname(ret),
|
|
dlm_errname(lksb.status));
|
|
res = dlm_lookup_lockres(dlm, DLM_RECOVERY_LOCK_NAME,
|
|
DLM_RECOVERY_LOCK_NAME_LEN);
|
|
if (res) {
|
|
dlm_print_one_lock_resource(res);
|
|
dlm_lockres_put(res);
|
|
} else {
|
|
mlog(ML_ERROR, "recovery lock not found\n");
|
|
}
|
|
BUG();
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
static int dlm_send_begin_reco_message(struct dlm_ctxt *dlm, u8 dead_node)
|
|
{
|
|
struct dlm_begin_reco br;
|
|
int ret = 0;
|
|
struct dlm_node_iter iter;
|
|
int nodenum;
|
|
int status;
|
|
|
|
mlog(0, "%s: dead node is %u\n", dlm->name, dead_node);
|
|
|
|
spin_lock(&dlm->spinlock);
|
|
dlm_node_iter_init(dlm->domain_map, &iter);
|
|
spin_unlock(&dlm->spinlock);
|
|
|
|
clear_bit(dead_node, iter.node_map);
|
|
|
|
memset(&br, 0, sizeof(br));
|
|
br.node_idx = dlm->node_num;
|
|
br.dead_node = dead_node;
|
|
|
|
while ((nodenum = dlm_node_iter_next(&iter)) >= 0) {
|
|
ret = 0;
|
|
if (nodenum == dead_node) {
|
|
mlog(0, "not sending begin reco to dead node "
|
|
"%u\n", dead_node);
|
|
continue;
|
|
}
|
|
if (nodenum == dlm->node_num) {
|
|
mlog(0, "not sending begin reco to self\n");
|
|
continue;
|
|
}
|
|
retry:
|
|
ret = -EINVAL;
|
|
mlog(0, "attempting to send begin reco msg to %d\n",
|
|
nodenum);
|
|
ret = o2net_send_message(DLM_BEGIN_RECO_MSG, dlm->key,
|
|
&br, sizeof(br), nodenum, &status);
|
|
/* negative status is handled ok by caller here */
|
|
if (ret >= 0)
|
|
ret = status;
|
|
if (dlm_is_host_down(ret)) {
|
|
/* node is down. not involved in recovery
|
|
* so just keep going */
|
|
mlog(ML_NOTICE, "%s: node %u was down when sending "
|
|
"begin reco msg (%d)\n", dlm->name, nodenum, ret);
|
|
ret = 0;
|
|
}
|
|
|
|
/*
|
|
* Prior to commit aad1b15310b9bcd59fa81ab8f2b1513b59553ea8,
|
|
* dlm_begin_reco_handler() returned EAGAIN and not -EAGAIN.
|
|
* We are handling both for compatibility reasons.
|
|
*/
|
|
if (ret == -EAGAIN || ret == EAGAIN) {
|
|
mlog(0, "%s: trying to start recovery of node "
|
|
"%u, but node %u is waiting for last recovery "
|
|
"to complete, backoff for a bit\n", dlm->name,
|
|
dead_node, nodenum);
|
|
msleep(100);
|
|
goto retry;
|
|
}
|
|
if (ret < 0) {
|
|
struct dlm_lock_resource *res;
|
|
|
|
/* this is now a serious problem, possibly ENOMEM
|
|
* in the network stack. must retry */
|
|
mlog_errno(ret);
|
|
mlog(ML_ERROR, "begin reco of dlm %s to node %u "
|
|
"returned %d\n", dlm->name, nodenum, ret);
|
|
res = dlm_lookup_lockres(dlm, DLM_RECOVERY_LOCK_NAME,
|
|
DLM_RECOVERY_LOCK_NAME_LEN);
|
|
if (res) {
|
|
dlm_print_one_lock_resource(res);
|
|
dlm_lockres_put(res);
|
|
} else {
|
|
mlog(ML_ERROR, "recovery lock not found\n");
|
|
}
|
|
/* sleep for a bit in hopes that we can avoid
|
|
* another ENOMEM */
|
|
msleep(100);
|
|
goto retry;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data,
|
|
void **ret_data)
|
|
{
|
|
struct dlm_ctxt *dlm = data;
|
|
struct dlm_begin_reco *br = (struct dlm_begin_reco *)msg->buf;
|
|
|
|
/* ok to return 0, domain has gone away */
|
|
if (!dlm_grab(dlm))
|
|
return 0;
|
|
|
|
spin_lock(&dlm->spinlock);
|
|
if (dlm->reco.state & DLM_RECO_STATE_FINALIZE) {
|
|
mlog(0, "%s: node %u wants to recover node %u (%u:%u) "
|
|
"but this node is in finalize state, waiting on finalize2\n",
|
|
dlm->name, br->node_idx, br->dead_node,
|
|
dlm->reco.dead_node, dlm->reco.new_master);
|
|
spin_unlock(&dlm->spinlock);
|
|
return -EAGAIN;
|
|
}
|
|
spin_unlock(&dlm->spinlock);
|
|
|
|
mlog(0, "%s: node %u wants to recover node %u (%u:%u)\n",
|
|
dlm->name, br->node_idx, br->dead_node,
|
|
dlm->reco.dead_node, dlm->reco.new_master);
|
|
|
|
dlm_fire_domain_eviction_callbacks(dlm, br->dead_node);
|
|
|
|
spin_lock(&dlm->spinlock);
|
|
if (dlm->reco.new_master != O2NM_INVALID_NODE_NUM) {
|
|
if (test_bit(dlm->reco.new_master, dlm->recovery_map)) {
|
|
mlog(0, "%s: new_master %u died, changing "
|
|
"to %u\n", dlm->name, dlm->reco.new_master,
|
|
br->node_idx);
|
|
} else {
|
|
mlog(0, "%s: new_master %u NOT DEAD, changing "
|
|
"to %u\n", dlm->name, dlm->reco.new_master,
|
|
br->node_idx);
|
|
/* may not have seen the new master as dead yet */
|
|
}
|
|
}
|
|
if (dlm->reco.dead_node != O2NM_INVALID_NODE_NUM) {
|
|
mlog(ML_NOTICE, "%s: dead_node previously set to %u, "
|
|
"node %u changing it to %u\n", dlm->name,
|
|
dlm->reco.dead_node, br->node_idx, br->dead_node);
|
|
}
|
|
dlm_set_reco_master(dlm, br->node_idx);
|
|
dlm_set_reco_dead_node(dlm, br->dead_node);
|
|
if (!test_bit(br->dead_node, dlm->recovery_map)) {
|
|
mlog(0, "recovery master %u sees %u as dead, but this "
|
|
"node has not yet. marking %u as dead\n",
|
|
br->node_idx, br->dead_node, br->dead_node);
|
|
if (!test_bit(br->dead_node, dlm->domain_map) ||
|
|
!test_bit(br->dead_node, dlm->live_nodes_map))
|
|
mlog(0, "%u not in domain/live_nodes map "
|
|
"so setting it in reco map manually\n",
|
|
br->dead_node);
|
|
/* force the recovery cleanup in __dlm_hb_node_down
|
|
* both of these will be cleared in a moment */
|
|
set_bit(br->dead_node, dlm->domain_map);
|
|
set_bit(br->dead_node, dlm->live_nodes_map);
|
|
__dlm_hb_node_down(dlm, br->dead_node);
|
|
}
|
|
spin_unlock(&dlm->spinlock);
|
|
|
|
dlm_kick_recovery_thread(dlm);
|
|
|
|
mlog(0, "%s: recovery started by node %u, for %u (%u:%u)\n",
|
|
dlm->name, br->node_idx, br->dead_node,
|
|
dlm->reco.dead_node, dlm->reco.new_master);
|
|
|
|
dlm_put(dlm);
|
|
return 0;
|
|
}
|
|
|
|
#define DLM_FINALIZE_STAGE2 0x01
|
|
static int dlm_send_finalize_reco_message(struct dlm_ctxt *dlm)
|
|
{
|
|
int ret = 0;
|
|
struct dlm_finalize_reco fr;
|
|
struct dlm_node_iter iter;
|
|
int nodenum;
|
|
int status;
|
|
int stage = 1;
|
|
|
|
mlog(0, "finishing recovery for node %s:%u, "
|
|
"stage %d\n", dlm->name, dlm->reco.dead_node, stage);
|
|
|
|
spin_lock(&dlm->spinlock);
|
|
dlm_node_iter_init(dlm->domain_map, &iter);
|
|
spin_unlock(&dlm->spinlock);
|
|
|
|
stage2:
|
|
memset(&fr, 0, sizeof(fr));
|
|
fr.node_idx = dlm->node_num;
|
|
fr.dead_node = dlm->reco.dead_node;
|
|
if (stage == 2)
|
|
fr.flags |= DLM_FINALIZE_STAGE2;
|
|
|
|
while ((nodenum = dlm_node_iter_next(&iter)) >= 0) {
|
|
if (nodenum == dlm->node_num)
|
|
continue;
|
|
ret = o2net_send_message(DLM_FINALIZE_RECO_MSG, dlm->key,
|
|
&fr, sizeof(fr), nodenum, &status);
|
|
if (ret >= 0)
|
|
ret = status;
|
|
if (ret < 0) {
|
|
mlog(ML_ERROR, "Error %d when sending message %u (key "
|
|
"0x%x) to node %u\n", ret, DLM_FINALIZE_RECO_MSG,
|
|
dlm->key, nodenum);
|
|
if (dlm_is_host_down(ret)) {
|
|
/* this has no effect on this recovery
|
|
* session, so set the status to zero to
|
|
* finish out the last recovery */
|
|
mlog(ML_ERROR, "node %u went down after this "
|
|
"node finished recovery.\n", nodenum);
|
|
ret = 0;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
if (stage == 1) {
|
|
/* reset the node_iter back to the top and send finalize2 */
|
|
iter.curnode = -1;
|
|
stage = 2;
|
|
goto stage2;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data,
|
|
void **ret_data)
|
|
{
|
|
struct dlm_ctxt *dlm = data;
|
|
struct dlm_finalize_reco *fr = (struct dlm_finalize_reco *)msg->buf;
|
|
int stage = 1;
|
|
|
|
/* ok to return 0, domain has gone away */
|
|
if (!dlm_grab(dlm))
|
|
return 0;
|
|
|
|
if (fr->flags & DLM_FINALIZE_STAGE2)
|
|
stage = 2;
|
|
|
|
mlog(0, "%s: node %u finalizing recovery stage%d of "
|
|
"node %u (%u:%u)\n", dlm->name, fr->node_idx, stage,
|
|
fr->dead_node, dlm->reco.dead_node, dlm->reco.new_master);
|
|
|
|
spin_lock(&dlm->spinlock);
|
|
|
|
if (dlm->reco.new_master != fr->node_idx) {
|
|
mlog(ML_ERROR, "node %u sent recovery finalize msg, but node "
|
|
"%u is supposed to be the new master, dead=%u\n",
|
|
fr->node_idx, dlm->reco.new_master, fr->dead_node);
|
|
BUG();
|
|
}
|
|
if (dlm->reco.dead_node != fr->dead_node) {
|
|
mlog(ML_ERROR, "node %u sent recovery finalize msg for dead "
|
|
"node %u, but node %u is supposed to be dead\n",
|
|
fr->node_idx, fr->dead_node, dlm->reco.dead_node);
|
|
BUG();
|
|
}
|
|
|
|
switch (stage) {
|
|
case 1:
|
|
dlm_finish_local_lockres_recovery(dlm, fr->dead_node, fr->node_idx);
|
|
if (dlm->reco.state & DLM_RECO_STATE_FINALIZE) {
|
|
mlog(ML_ERROR, "%s: received finalize1 from "
|
|
"new master %u for dead node %u, but "
|
|
"this node has already received it!\n",
|
|
dlm->name, fr->node_idx, fr->dead_node);
|
|
dlm_print_reco_node_status(dlm);
|
|
BUG();
|
|
}
|
|
dlm->reco.state |= DLM_RECO_STATE_FINALIZE;
|
|
spin_unlock(&dlm->spinlock);
|
|
break;
|
|
case 2:
|
|
if (!(dlm->reco.state & DLM_RECO_STATE_FINALIZE)) {
|
|
mlog(ML_ERROR, "%s: received finalize2 from "
|
|
"new master %u for dead node %u, but "
|
|
"this node did not have finalize1!\n",
|
|
dlm->name, fr->node_idx, fr->dead_node);
|
|
dlm_print_reco_node_status(dlm);
|
|
BUG();
|
|
}
|
|
dlm->reco.state &= ~DLM_RECO_STATE_FINALIZE;
|
|
spin_unlock(&dlm->spinlock);
|
|
dlm_reset_recovery(dlm);
|
|
dlm_kick_recovery_thread(dlm);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
mlog(0, "%s: recovery done, reco master was %u, dead now %u, master now %u\n",
|
|
dlm->name, fr->node_idx, dlm->reco.dead_node, dlm->reco.new_master);
|
|
|
|
dlm_put(dlm);
|
|
return 0;
|
|
}
|