![Sunil Mushran](/assets/img/avatar_default.png)
The inflight reference count, in the lock resource, is taken to pin the resource in memory. We take it when a new resource is created and release it after a lock is attached to it. We do this to prevent the resource from getting purged prematurely. Earlier this reference count was being taken for locally mastered resources only. This patch extends the same functionality for remotely mastered ones. We are doing this because the same premature purging could occur for remotely mastered resources if the remote node were to die before completion of the create lock. Fix for Oracle bug#12405575. Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
763 lines
21 KiB
C
763 lines
21 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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* dlmthread.c
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*
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* standalone DLM module
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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/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_THREAD)
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#include "cluster/masklog.h"
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static int dlm_thread(void *data);
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static void dlm_flush_asts(struct dlm_ctxt *dlm);
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#define dlm_lock_is_remote(dlm, lock) ((lock)->ml.node != (dlm)->node_num)
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/* will exit holding res->spinlock, but may drop in function */
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/* waits until flags are cleared on res->state */
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void __dlm_wait_on_lockres_flags(struct dlm_lock_resource *res, int flags)
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{
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DECLARE_WAITQUEUE(wait, current);
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assert_spin_locked(&res->spinlock);
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add_wait_queue(&res->wq, &wait);
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repeat:
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set_current_state(TASK_UNINTERRUPTIBLE);
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if (res->state & flags) {
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spin_unlock(&res->spinlock);
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schedule();
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spin_lock(&res->spinlock);
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goto repeat;
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}
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remove_wait_queue(&res->wq, &wait);
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__set_current_state(TASK_RUNNING);
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}
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int __dlm_lockres_has_locks(struct dlm_lock_resource *res)
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{
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if (list_empty(&res->granted) &&
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list_empty(&res->converting) &&
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list_empty(&res->blocked))
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return 0;
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return 1;
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}
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/* "unused": the lockres has no locks, is not on the dirty list,
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* has no inflight locks (in the gap between mastery and acquiring
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* the first lock), and has no bits in its refmap.
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* truly ready to be freed. */
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int __dlm_lockres_unused(struct dlm_lock_resource *res)
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{
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int bit;
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assert_spin_locked(&res->spinlock);
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if (__dlm_lockres_has_locks(res))
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return 0;
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/* Locks are in the process of being created */
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if (res->inflight_locks)
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return 0;
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if (!list_empty(&res->dirty) || res->state & DLM_LOCK_RES_DIRTY)
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return 0;
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if (res->state & DLM_LOCK_RES_RECOVERING)
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return 0;
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/* Another node has this resource with this node as the master */
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bit = find_next_bit(res->refmap, O2NM_MAX_NODES, 0);
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if (bit < O2NM_MAX_NODES)
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return 0;
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return 1;
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}
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/* Call whenever you may have added or deleted something from one of
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* the lockres queue's. This will figure out whether it belongs on the
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* unused list or not and does the appropriate thing. */
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void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
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struct dlm_lock_resource *res)
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{
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assert_spin_locked(&dlm->spinlock);
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assert_spin_locked(&res->spinlock);
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if (__dlm_lockres_unused(res)){
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if (list_empty(&res->purge)) {
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mlog(0, "%s: Adding res %.*s to purge list\n",
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dlm->name, res->lockname.len, res->lockname.name);
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res->last_used = jiffies;
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dlm_lockres_get(res);
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list_add_tail(&res->purge, &dlm->purge_list);
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dlm->purge_count++;
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}
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} else if (!list_empty(&res->purge)) {
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mlog(0, "%s: Removing res %.*s from purge list\n",
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dlm->name, res->lockname.len, res->lockname.name);
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list_del_init(&res->purge);
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dlm_lockres_put(res);
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dlm->purge_count--;
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}
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}
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void dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
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struct dlm_lock_resource *res)
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{
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spin_lock(&dlm->spinlock);
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spin_lock(&res->spinlock);
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__dlm_lockres_calc_usage(dlm, res);
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spin_unlock(&res->spinlock);
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spin_unlock(&dlm->spinlock);
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}
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static void dlm_purge_lockres(struct dlm_ctxt *dlm,
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struct dlm_lock_resource *res)
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{
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int master;
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int ret = 0;
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assert_spin_locked(&dlm->spinlock);
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assert_spin_locked(&res->spinlock);
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master = (res->owner == dlm->node_num);
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mlog(0, "%s: Purging res %.*s, master %d\n", dlm->name,
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res->lockname.len, res->lockname.name, master);
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if (!master) {
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res->state |= DLM_LOCK_RES_DROPPING_REF;
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/* drop spinlock... retake below */
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spin_unlock(&res->spinlock);
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spin_unlock(&dlm->spinlock);
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spin_lock(&res->spinlock);
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/* This ensures that clear refmap is sent after the set */
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__dlm_wait_on_lockres_flags(res, DLM_LOCK_RES_SETREF_INPROG);
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spin_unlock(&res->spinlock);
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/* clear our bit from the master's refmap, ignore errors */
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ret = dlm_drop_lockres_ref(dlm, res);
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if (ret < 0) {
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if (!dlm_is_host_down(ret))
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BUG();
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}
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spin_lock(&dlm->spinlock);
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spin_lock(&res->spinlock);
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}
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if (!list_empty(&res->purge)) {
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mlog(0, "%s: Removing res %.*s from purgelist, master %d\n",
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dlm->name, res->lockname.len, res->lockname.name, master);
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list_del_init(&res->purge);
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dlm_lockres_put(res);
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dlm->purge_count--;
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}
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if (!__dlm_lockres_unused(res)) {
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mlog(ML_ERROR, "%s: res %.*s in use after deref\n",
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dlm->name, res->lockname.len, res->lockname.name);
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__dlm_print_one_lock_resource(res);
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BUG();
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}
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__dlm_unhash_lockres(dlm, res);
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/* lockres is not in the hash now. drop the flag and wake up
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* any processes waiting in dlm_get_lock_resource. */
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if (!master) {
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res->state &= ~DLM_LOCK_RES_DROPPING_REF;
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spin_unlock(&res->spinlock);
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wake_up(&res->wq);
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} else
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spin_unlock(&res->spinlock);
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}
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static void dlm_run_purge_list(struct dlm_ctxt *dlm,
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int purge_now)
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{
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unsigned int run_max, unused;
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unsigned long purge_jiffies;
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struct dlm_lock_resource *lockres;
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spin_lock(&dlm->spinlock);
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run_max = dlm->purge_count;
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while(run_max && !list_empty(&dlm->purge_list)) {
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run_max--;
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lockres = list_entry(dlm->purge_list.next,
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struct dlm_lock_resource, purge);
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spin_lock(&lockres->spinlock);
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purge_jiffies = lockres->last_used +
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msecs_to_jiffies(DLM_PURGE_INTERVAL_MS);
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/* Make sure that we want to be processing this guy at
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* this time. */
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if (!purge_now && time_after(purge_jiffies, jiffies)) {
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/* Since resources are added to the purge list
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* in tail order, we can stop at the first
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* unpurgable resource -- anyone added after
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* him will have a greater last_used value */
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spin_unlock(&lockres->spinlock);
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break;
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}
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/* Status of the lockres *might* change so double
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* check. If the lockres is unused, holding the dlm
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* spinlock will prevent people from getting and more
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* refs on it. */
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unused = __dlm_lockres_unused(lockres);
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if (!unused ||
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(lockres->state & DLM_LOCK_RES_MIGRATING)) {
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mlog(0, "%s: res %.*s is in use or being remastered, "
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"used %d, state %d\n", dlm->name,
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lockres->lockname.len, lockres->lockname.name,
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!unused, lockres->state);
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list_move_tail(&dlm->purge_list, &lockres->purge);
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spin_unlock(&lockres->spinlock);
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continue;
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}
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dlm_lockres_get(lockres);
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dlm_purge_lockres(dlm, lockres);
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dlm_lockres_put(lockres);
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/* Avoid adding any scheduling latencies */
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cond_resched_lock(&dlm->spinlock);
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}
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spin_unlock(&dlm->spinlock);
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}
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static void dlm_shuffle_lists(struct dlm_ctxt *dlm,
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struct dlm_lock_resource *res)
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{
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struct dlm_lock *lock, *target;
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struct list_head *iter;
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struct list_head *head;
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int can_grant = 1;
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/*
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* Because this function is called with the lockres
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* spinlock, and because we know that it is not migrating/
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* recovering/in-progress, it is fine to reserve asts and
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* basts right before queueing them all throughout
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*/
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assert_spin_locked(&dlm->ast_lock);
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assert_spin_locked(&res->spinlock);
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BUG_ON((res->state & (DLM_LOCK_RES_MIGRATING|
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DLM_LOCK_RES_RECOVERING|
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DLM_LOCK_RES_IN_PROGRESS)));
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converting:
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if (list_empty(&res->converting))
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goto blocked;
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mlog(0, "%s: res %.*s has locks on the convert queue\n", dlm->name,
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res->lockname.len, res->lockname.name);
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target = list_entry(res->converting.next, struct dlm_lock, list);
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if (target->ml.convert_type == LKM_IVMODE) {
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mlog(ML_ERROR, "%s: res %.*s converting lock to invalid mode\n",
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dlm->name, res->lockname.len, res->lockname.name);
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BUG();
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}
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head = &res->granted;
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list_for_each(iter, head) {
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lock = list_entry(iter, struct dlm_lock, list);
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if (lock==target)
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continue;
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if (!dlm_lock_compatible(lock->ml.type,
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target->ml.convert_type)) {
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can_grant = 0;
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/* queue the BAST if not already */
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if (lock->ml.highest_blocked == LKM_IVMODE) {
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__dlm_lockres_reserve_ast(res);
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__dlm_queue_bast(dlm, lock);
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}
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/* update the highest_blocked if needed */
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if (lock->ml.highest_blocked < target->ml.convert_type)
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lock->ml.highest_blocked =
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target->ml.convert_type;
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}
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}
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head = &res->converting;
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list_for_each(iter, head) {
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lock = list_entry(iter, struct dlm_lock, list);
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if (lock==target)
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continue;
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if (!dlm_lock_compatible(lock->ml.type,
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target->ml.convert_type)) {
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can_grant = 0;
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if (lock->ml.highest_blocked == LKM_IVMODE) {
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__dlm_lockres_reserve_ast(res);
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__dlm_queue_bast(dlm, lock);
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}
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if (lock->ml.highest_blocked < target->ml.convert_type)
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lock->ml.highest_blocked =
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target->ml.convert_type;
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}
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}
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/* we can convert the lock */
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if (can_grant) {
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spin_lock(&target->spinlock);
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BUG_ON(target->ml.highest_blocked != LKM_IVMODE);
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mlog(0, "%s: res %.*s, AST for Converting lock %u:%llu, type "
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"%d => %d, node %u\n", dlm->name, res->lockname.len,
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res->lockname.name,
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dlm_get_lock_cookie_node(be64_to_cpu(target->ml.cookie)),
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dlm_get_lock_cookie_seq(be64_to_cpu(target->ml.cookie)),
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target->ml.type,
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target->ml.convert_type, target->ml.node);
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target->ml.type = target->ml.convert_type;
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target->ml.convert_type = LKM_IVMODE;
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list_move_tail(&target->list, &res->granted);
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BUG_ON(!target->lksb);
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target->lksb->status = DLM_NORMAL;
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spin_unlock(&target->spinlock);
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__dlm_lockres_reserve_ast(res);
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__dlm_queue_ast(dlm, target);
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/* go back and check for more */
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goto converting;
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}
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blocked:
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if (list_empty(&res->blocked))
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goto leave;
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target = list_entry(res->blocked.next, struct dlm_lock, list);
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head = &res->granted;
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list_for_each(iter, head) {
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lock = list_entry(iter, struct dlm_lock, list);
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if (lock==target)
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continue;
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if (!dlm_lock_compatible(lock->ml.type, target->ml.type)) {
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can_grant = 0;
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if (lock->ml.highest_blocked == LKM_IVMODE) {
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__dlm_lockres_reserve_ast(res);
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__dlm_queue_bast(dlm, lock);
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}
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if (lock->ml.highest_blocked < target->ml.type)
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lock->ml.highest_blocked = target->ml.type;
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}
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}
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head = &res->converting;
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list_for_each(iter, head) {
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lock = list_entry(iter, struct dlm_lock, list);
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if (lock==target)
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continue;
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if (!dlm_lock_compatible(lock->ml.type, target->ml.type)) {
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can_grant = 0;
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if (lock->ml.highest_blocked == LKM_IVMODE) {
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__dlm_lockres_reserve_ast(res);
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__dlm_queue_bast(dlm, lock);
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}
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if (lock->ml.highest_blocked < target->ml.type)
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lock->ml.highest_blocked = target->ml.type;
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}
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}
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/* we can grant the blocked lock (only
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* possible if converting list empty) */
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if (can_grant) {
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spin_lock(&target->spinlock);
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BUG_ON(target->ml.highest_blocked != LKM_IVMODE);
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mlog(0, "%s: res %.*s, AST for Blocked lock %u:%llu, type %d, "
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"node %u\n", dlm->name, res->lockname.len,
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res->lockname.name,
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dlm_get_lock_cookie_node(be64_to_cpu(target->ml.cookie)),
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dlm_get_lock_cookie_seq(be64_to_cpu(target->ml.cookie)),
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target->ml.type, target->ml.node);
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/* target->ml.type is already correct */
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list_move_tail(&target->list, &res->granted);
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BUG_ON(!target->lksb);
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target->lksb->status = DLM_NORMAL;
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spin_unlock(&target->spinlock);
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__dlm_lockres_reserve_ast(res);
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__dlm_queue_ast(dlm, target);
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/* go back and check for more */
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goto converting;
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}
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leave:
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return;
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}
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/* must have NO locks when calling this with res !=NULL * */
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void dlm_kick_thread(struct dlm_ctxt *dlm, struct dlm_lock_resource *res)
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{
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if (res) {
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spin_lock(&dlm->spinlock);
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spin_lock(&res->spinlock);
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__dlm_dirty_lockres(dlm, res);
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spin_unlock(&res->spinlock);
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spin_unlock(&dlm->spinlock);
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}
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wake_up(&dlm->dlm_thread_wq);
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}
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void __dlm_dirty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res)
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{
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assert_spin_locked(&dlm->spinlock);
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assert_spin_locked(&res->spinlock);
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/* don't shuffle secondary queues */
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if ((res->owner == dlm->node_num)) {
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if (res->state & (DLM_LOCK_RES_MIGRATING |
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DLM_LOCK_RES_BLOCK_DIRTY))
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return;
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if (list_empty(&res->dirty)) {
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/* ref for dirty_list */
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dlm_lockres_get(res);
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list_add_tail(&res->dirty, &dlm->dirty_list);
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res->state |= DLM_LOCK_RES_DIRTY;
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}
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}
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mlog(0, "%s: res %.*s\n", dlm->name, res->lockname.len,
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res->lockname.name);
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}
|
|
|
|
|
|
/* Launch the NM thread for the mounted volume */
|
|
int dlm_launch_thread(struct dlm_ctxt *dlm)
|
|
{
|
|
mlog(0, "Starting dlm_thread...\n");
|
|
|
|
dlm->dlm_thread_task = kthread_run(dlm_thread, dlm, "dlm_thread");
|
|
if (IS_ERR(dlm->dlm_thread_task)) {
|
|
mlog_errno(PTR_ERR(dlm->dlm_thread_task));
|
|
dlm->dlm_thread_task = NULL;
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void dlm_complete_thread(struct dlm_ctxt *dlm)
|
|
{
|
|
if (dlm->dlm_thread_task) {
|
|
mlog(ML_KTHREAD, "Waiting for dlm thread to exit\n");
|
|
kthread_stop(dlm->dlm_thread_task);
|
|
dlm->dlm_thread_task = NULL;
|
|
}
|
|
}
|
|
|
|
static int dlm_dirty_list_empty(struct dlm_ctxt *dlm)
|
|
{
|
|
int empty;
|
|
|
|
spin_lock(&dlm->spinlock);
|
|
empty = list_empty(&dlm->dirty_list);
|
|
spin_unlock(&dlm->spinlock);
|
|
|
|
return empty;
|
|
}
|
|
|
|
static void dlm_flush_asts(struct dlm_ctxt *dlm)
|
|
{
|
|
int ret;
|
|
struct dlm_lock *lock;
|
|
struct dlm_lock_resource *res;
|
|
u8 hi;
|
|
|
|
spin_lock(&dlm->ast_lock);
|
|
while (!list_empty(&dlm->pending_asts)) {
|
|
lock = list_entry(dlm->pending_asts.next,
|
|
struct dlm_lock, ast_list);
|
|
/* get an extra ref on lock */
|
|
dlm_lock_get(lock);
|
|
res = lock->lockres;
|
|
mlog(0, "%s: res %.*s, Flush AST for lock %u:%llu, type %d, "
|
|
"node %u\n", dlm->name, res->lockname.len,
|
|
res->lockname.name,
|
|
dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
|
|
dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
|
|
lock->ml.type, lock->ml.node);
|
|
|
|
BUG_ON(!lock->ast_pending);
|
|
|
|
/* remove from list (including ref) */
|
|
list_del_init(&lock->ast_list);
|
|
dlm_lock_put(lock);
|
|
spin_unlock(&dlm->ast_lock);
|
|
|
|
if (lock->ml.node != dlm->node_num) {
|
|
ret = dlm_do_remote_ast(dlm, res, lock);
|
|
if (ret < 0)
|
|
mlog_errno(ret);
|
|
} else
|
|
dlm_do_local_ast(dlm, res, lock);
|
|
|
|
spin_lock(&dlm->ast_lock);
|
|
|
|
/* possible that another ast was queued while
|
|
* we were delivering the last one */
|
|
if (!list_empty(&lock->ast_list)) {
|
|
mlog(0, "%s: res %.*s, AST queued while flushing last "
|
|
"one\n", dlm->name, res->lockname.len,
|
|
res->lockname.name);
|
|
} else
|
|
lock->ast_pending = 0;
|
|
|
|
/* drop the extra ref.
|
|
* this may drop it completely. */
|
|
dlm_lock_put(lock);
|
|
dlm_lockres_release_ast(dlm, res);
|
|
}
|
|
|
|
while (!list_empty(&dlm->pending_basts)) {
|
|
lock = list_entry(dlm->pending_basts.next,
|
|
struct dlm_lock, bast_list);
|
|
/* get an extra ref on lock */
|
|
dlm_lock_get(lock);
|
|
res = lock->lockres;
|
|
|
|
BUG_ON(!lock->bast_pending);
|
|
|
|
/* get the highest blocked lock, and reset */
|
|
spin_lock(&lock->spinlock);
|
|
BUG_ON(lock->ml.highest_blocked <= LKM_IVMODE);
|
|
hi = lock->ml.highest_blocked;
|
|
lock->ml.highest_blocked = LKM_IVMODE;
|
|
spin_unlock(&lock->spinlock);
|
|
|
|
/* remove from list (including ref) */
|
|
list_del_init(&lock->bast_list);
|
|
dlm_lock_put(lock);
|
|
spin_unlock(&dlm->ast_lock);
|
|
|
|
mlog(0, "%s: res %.*s, Flush BAST for lock %u:%llu, "
|
|
"blocked %d, node %u\n",
|
|
dlm->name, res->lockname.len, res->lockname.name,
|
|
dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
|
|
dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
|
|
hi, lock->ml.node);
|
|
|
|
if (lock->ml.node != dlm->node_num) {
|
|
ret = dlm_send_proxy_bast(dlm, res, lock, hi);
|
|
if (ret < 0)
|
|
mlog_errno(ret);
|
|
} else
|
|
dlm_do_local_bast(dlm, res, lock, hi);
|
|
|
|
spin_lock(&dlm->ast_lock);
|
|
|
|
/* possible that another bast was queued while
|
|
* we were delivering the last one */
|
|
if (!list_empty(&lock->bast_list)) {
|
|
mlog(0, "%s: res %.*s, BAST queued while flushing last "
|
|
"one\n", dlm->name, res->lockname.len,
|
|
res->lockname.name);
|
|
} else
|
|
lock->bast_pending = 0;
|
|
|
|
/* drop the extra ref.
|
|
* this may drop it completely. */
|
|
dlm_lock_put(lock);
|
|
dlm_lockres_release_ast(dlm, res);
|
|
}
|
|
wake_up(&dlm->ast_wq);
|
|
spin_unlock(&dlm->ast_lock);
|
|
}
|
|
|
|
|
|
#define DLM_THREAD_TIMEOUT_MS (4 * 1000)
|
|
#define DLM_THREAD_MAX_DIRTY 100
|
|
#define DLM_THREAD_MAX_ASTS 10
|
|
|
|
static int dlm_thread(void *data)
|
|
{
|
|
struct dlm_lock_resource *res;
|
|
struct dlm_ctxt *dlm = data;
|
|
unsigned long timeout = msecs_to_jiffies(DLM_THREAD_TIMEOUT_MS);
|
|
|
|
mlog(0, "dlm thread running for %s...\n", dlm->name);
|
|
|
|
while (!kthread_should_stop()) {
|
|
int n = DLM_THREAD_MAX_DIRTY;
|
|
|
|
/* dlm_shutting_down is very point-in-time, but that
|
|
* doesn't matter as we'll just loop back around if we
|
|
* get false on the leading edge of a state
|
|
* transition. */
|
|
dlm_run_purge_list(dlm, dlm_shutting_down(dlm));
|
|
|
|
/* We really don't want to hold dlm->spinlock while
|
|
* calling dlm_shuffle_lists on each lockres that
|
|
* needs to have its queues adjusted and AST/BASTs
|
|
* run. So let's pull each entry off the dirty_list
|
|
* and drop dlm->spinlock ASAP. Once off the list,
|
|
* res->spinlock needs to be taken again to protect
|
|
* the queues while calling dlm_shuffle_lists. */
|
|
spin_lock(&dlm->spinlock);
|
|
while (!list_empty(&dlm->dirty_list)) {
|
|
int delay = 0;
|
|
res = list_entry(dlm->dirty_list.next,
|
|
struct dlm_lock_resource, dirty);
|
|
|
|
/* peel a lockres off, remove it from the list,
|
|
* unset the dirty flag and drop the dlm lock */
|
|
BUG_ON(!res);
|
|
dlm_lockres_get(res);
|
|
|
|
spin_lock(&res->spinlock);
|
|
/* We clear the DLM_LOCK_RES_DIRTY state once we shuffle lists below */
|
|
list_del_init(&res->dirty);
|
|
spin_unlock(&res->spinlock);
|
|
spin_unlock(&dlm->spinlock);
|
|
/* Drop dirty_list ref */
|
|
dlm_lockres_put(res);
|
|
|
|
/* lockres can be re-dirtied/re-added to the
|
|
* dirty_list in this gap, but that is ok */
|
|
|
|
spin_lock(&dlm->ast_lock);
|
|
spin_lock(&res->spinlock);
|
|
if (res->owner != dlm->node_num) {
|
|
__dlm_print_one_lock_resource(res);
|
|
mlog(ML_ERROR, "%s: inprog %d, mig %d, reco %d,"
|
|
" dirty %d\n", dlm->name,
|
|
!!(res->state & DLM_LOCK_RES_IN_PROGRESS),
|
|
!!(res->state & DLM_LOCK_RES_MIGRATING),
|
|
!!(res->state & DLM_LOCK_RES_RECOVERING),
|
|
!!(res->state & DLM_LOCK_RES_DIRTY));
|
|
}
|
|
BUG_ON(res->owner != dlm->node_num);
|
|
|
|
/* it is now ok to move lockreses in these states
|
|
* to the dirty list, assuming that they will only be
|
|
* dirty for a short while. */
|
|
BUG_ON(res->state & DLM_LOCK_RES_MIGRATING);
|
|
if (res->state & (DLM_LOCK_RES_IN_PROGRESS |
|
|
DLM_LOCK_RES_RECOVERING)) {
|
|
/* move it to the tail and keep going */
|
|
res->state &= ~DLM_LOCK_RES_DIRTY;
|
|
spin_unlock(&res->spinlock);
|
|
spin_unlock(&dlm->ast_lock);
|
|
mlog(0, "%s: res %.*s, inprogress, delay list "
|
|
"shuffle, state %d\n", dlm->name,
|
|
res->lockname.len, res->lockname.name,
|
|
res->state);
|
|
delay = 1;
|
|
goto in_progress;
|
|
}
|
|
|
|
/* at this point the lockres is not migrating/
|
|
* recovering/in-progress. we have the lockres
|
|
* spinlock and do NOT have the dlm lock.
|
|
* safe to reserve/queue asts and run the lists. */
|
|
|
|
/* called while holding lockres lock */
|
|
dlm_shuffle_lists(dlm, res);
|
|
res->state &= ~DLM_LOCK_RES_DIRTY;
|
|
spin_unlock(&res->spinlock);
|
|
spin_unlock(&dlm->ast_lock);
|
|
|
|
dlm_lockres_calc_usage(dlm, res);
|
|
|
|
in_progress:
|
|
|
|
spin_lock(&dlm->spinlock);
|
|
/* if the lock was in-progress, stick
|
|
* it on the back of the list */
|
|
if (delay) {
|
|
spin_lock(&res->spinlock);
|
|
__dlm_dirty_lockres(dlm, res);
|
|
spin_unlock(&res->spinlock);
|
|
}
|
|
dlm_lockres_put(res);
|
|
|
|
/* unlikely, but we may need to give time to
|
|
* other tasks */
|
|
if (!--n) {
|
|
mlog(0, "%s: Throttling dlm thread\n",
|
|
dlm->name);
|
|
break;
|
|
}
|
|
}
|
|
|
|
spin_unlock(&dlm->spinlock);
|
|
dlm_flush_asts(dlm);
|
|
|
|
/* yield and continue right away if there is more work to do */
|
|
if (!n) {
|
|
cond_resched();
|
|
continue;
|
|
}
|
|
|
|
wait_event_interruptible_timeout(dlm->dlm_thread_wq,
|
|
!dlm_dirty_list_empty(dlm) ||
|
|
kthread_should_stop(),
|
|
timeout);
|
|
}
|
|
|
|
mlog(0, "quitting DLM thread\n");
|
|
return 0;
|
|
}
|