![Peter Zijlstra](/assets/img/avatar_default.png)
Since we need to change the implementation, stop exposing internals. Provide kref_read() to read the current reference count; typically used for debug messages. Kills two anti-patterns: atomic_read(&kref->refcount) kref->refcount.counter Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
699 lines
19 KiB
C
699 lines
19 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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* dlmunlock.c
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*
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* underlying calls for unlocking locks
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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/spinlock.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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#define MLOG_MASK_PREFIX ML_DLM
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#include "cluster/masklog.h"
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#define DLM_UNLOCK_FREE_LOCK 0x00000001
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#define DLM_UNLOCK_CALL_AST 0x00000002
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#define DLM_UNLOCK_REMOVE_LOCK 0x00000004
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#define DLM_UNLOCK_REGRANT_LOCK 0x00000008
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#define DLM_UNLOCK_CLEAR_CONVERT_TYPE 0x00000010
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static enum dlm_status dlm_get_cancel_actions(struct dlm_ctxt *dlm,
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struct dlm_lock_resource *res,
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struct dlm_lock *lock,
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struct dlm_lockstatus *lksb,
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int *actions);
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static enum dlm_status dlm_get_unlock_actions(struct dlm_ctxt *dlm,
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struct dlm_lock_resource *res,
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struct dlm_lock *lock,
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struct dlm_lockstatus *lksb,
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int *actions);
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static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm,
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struct dlm_lock_resource *res,
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struct dlm_lock *lock,
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struct dlm_lockstatus *lksb,
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int flags,
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u8 owner);
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/*
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* according to the spec:
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* http://opendlm.sourceforge.net/cvsmirror/opendlm/docs/dlmbook_final.pdf
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*
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* flags & LKM_CANCEL != 0: must be converting or blocked
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* flags & LKM_CANCEL == 0: must be granted
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*
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* So to unlock a converting lock, you must first cancel the
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* convert (passing LKM_CANCEL in flags), then call the unlock
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* again (with no LKM_CANCEL in flags).
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*/
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/*
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* locking:
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* caller needs: none
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* taken: res->spinlock and lock->spinlock taken and dropped
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* held on exit: none
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* returns: DLM_NORMAL, DLM_NOLOCKMGR, status from network
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* all callers should have taken an extra ref on lock coming in
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*/
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static enum dlm_status dlmunlock_common(struct dlm_ctxt *dlm,
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struct dlm_lock_resource *res,
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struct dlm_lock *lock,
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struct dlm_lockstatus *lksb,
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int flags, int *call_ast,
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int master_node)
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{
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enum dlm_status status;
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int actions = 0;
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int in_use;
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u8 owner;
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mlog(0, "master_node = %d, valblk = %d\n", master_node,
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flags & LKM_VALBLK);
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if (master_node)
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BUG_ON(res->owner != dlm->node_num);
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else
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BUG_ON(res->owner == dlm->node_num);
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spin_lock(&dlm->ast_lock);
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/* We want to be sure that we're not freeing a lock
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* that still has AST's pending... */
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in_use = !list_empty(&lock->ast_list);
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spin_unlock(&dlm->ast_lock);
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if (in_use && !(flags & LKM_CANCEL)) {
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mlog(ML_ERROR, "lockres %.*s: Someone is calling dlmunlock "
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"while waiting for an ast!", res->lockname.len,
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res->lockname.name);
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return DLM_BADPARAM;
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}
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spin_lock(&res->spinlock);
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if (res->state & DLM_LOCK_RES_IN_PROGRESS) {
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if (master_node && !(flags & LKM_CANCEL)) {
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mlog(ML_ERROR, "lockres in progress!\n");
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spin_unlock(&res->spinlock);
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return DLM_FORWARD;
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}
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/* ok for this to sleep if not in a network handler */
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__dlm_wait_on_lockres(res);
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res->state |= DLM_LOCK_RES_IN_PROGRESS;
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}
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spin_lock(&lock->spinlock);
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if (res->state & DLM_LOCK_RES_RECOVERING) {
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status = DLM_RECOVERING;
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goto leave;
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}
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if (res->state & DLM_LOCK_RES_MIGRATING) {
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status = DLM_MIGRATING;
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goto leave;
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}
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/* see above for what the spec says about
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* LKM_CANCEL and the lock queue state */
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if (flags & LKM_CANCEL)
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status = dlm_get_cancel_actions(dlm, res, lock, lksb, &actions);
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else
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status = dlm_get_unlock_actions(dlm, res, lock, lksb, &actions);
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if (status != DLM_NORMAL && (status != DLM_CANCELGRANT || !master_node))
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goto leave;
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/* By now this has been masked out of cancel requests. */
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if (flags & LKM_VALBLK) {
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/* make the final update to the lvb */
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if (master_node)
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memcpy(res->lvb, lksb->lvb, DLM_LVB_LEN);
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else
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flags |= LKM_PUT_LVB; /* let the send function
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* handle it. */
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}
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if (!master_node) {
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owner = res->owner;
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/* drop locks and send message */
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if (flags & LKM_CANCEL)
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lock->cancel_pending = 1;
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else
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lock->unlock_pending = 1;
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spin_unlock(&lock->spinlock);
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spin_unlock(&res->spinlock);
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status = dlm_send_remote_unlock_request(dlm, res, lock, lksb,
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flags, owner);
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spin_lock(&res->spinlock);
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spin_lock(&lock->spinlock);
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/* if the master told us the lock was already granted,
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* let the ast handle all of these actions */
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if (status == DLM_CANCELGRANT) {
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actions &= ~(DLM_UNLOCK_REMOVE_LOCK|
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DLM_UNLOCK_REGRANT_LOCK|
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DLM_UNLOCK_CLEAR_CONVERT_TYPE);
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} else if (status == DLM_RECOVERING ||
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status == DLM_MIGRATING ||
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status == DLM_FORWARD ||
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status == DLM_NOLOCKMGR
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) {
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/* must clear the actions because this unlock
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* is about to be retried. cannot free or do
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* any list manipulation. */
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mlog(0, "%s:%.*s: clearing actions, %s\n",
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dlm->name, res->lockname.len,
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res->lockname.name,
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status==DLM_RECOVERING?"recovering":
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(status==DLM_MIGRATING?"migrating":
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(status == DLM_FORWARD ? "forward" :
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"nolockmanager")));
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actions = 0;
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}
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if (flags & LKM_CANCEL)
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lock->cancel_pending = 0;
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else
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lock->unlock_pending = 0;
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}
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/* get an extra ref on lock. if we are just switching
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* lists here, we dont want the lock to go away. */
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dlm_lock_get(lock);
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if (actions & DLM_UNLOCK_REMOVE_LOCK) {
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list_del_init(&lock->list);
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dlm_lock_put(lock);
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}
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if (actions & DLM_UNLOCK_REGRANT_LOCK) {
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dlm_lock_get(lock);
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list_add_tail(&lock->list, &res->granted);
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}
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if (actions & DLM_UNLOCK_CLEAR_CONVERT_TYPE) {
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mlog(0, "clearing convert_type at %smaster node\n",
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master_node ? "" : "non-");
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lock->ml.convert_type = LKM_IVMODE;
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}
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/* remove the extra ref on lock */
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dlm_lock_put(lock);
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leave:
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res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
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if (!dlm_lock_on_list(&res->converting, lock))
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BUG_ON(lock->ml.convert_type != LKM_IVMODE);
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else
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BUG_ON(lock->ml.convert_type == LKM_IVMODE);
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spin_unlock(&lock->spinlock);
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spin_unlock(&res->spinlock);
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wake_up(&res->wq);
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/* let the caller's final dlm_lock_put handle the actual kfree */
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if (actions & DLM_UNLOCK_FREE_LOCK) {
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/* this should always be coupled with list removal */
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BUG_ON(!(actions & DLM_UNLOCK_REMOVE_LOCK));
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mlog(0, "lock %u:%llu should be gone now! refs=%d\n",
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dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
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dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
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kref_read(&lock->lock_refs)-1);
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dlm_lock_put(lock);
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}
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if (actions & DLM_UNLOCK_CALL_AST)
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*call_ast = 1;
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/* if cancel or unlock succeeded, lvb work is done */
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if (status == DLM_NORMAL)
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lksb->flags &= ~(DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB);
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return status;
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}
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void dlm_commit_pending_unlock(struct dlm_lock_resource *res,
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struct dlm_lock *lock)
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{
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/* leave DLM_LKSB_PUT_LVB on the lksb so any final
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* update of the lvb will be sent to the new master */
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list_del_init(&lock->list);
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}
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void dlm_commit_pending_cancel(struct dlm_lock_resource *res,
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struct dlm_lock *lock)
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{
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list_move_tail(&lock->list, &res->granted);
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lock->ml.convert_type = LKM_IVMODE;
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}
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static inline enum dlm_status dlmunlock_master(struct dlm_ctxt *dlm,
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struct dlm_lock_resource *res,
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struct dlm_lock *lock,
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struct dlm_lockstatus *lksb,
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int flags,
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int *call_ast)
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{
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return dlmunlock_common(dlm, res, lock, lksb, flags, call_ast, 1);
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}
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static inline enum dlm_status dlmunlock_remote(struct dlm_ctxt *dlm,
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struct dlm_lock_resource *res,
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struct dlm_lock *lock,
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struct dlm_lockstatus *lksb,
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int flags, int *call_ast)
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{
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return dlmunlock_common(dlm, res, lock, lksb, flags, call_ast, 0);
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}
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/*
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* locking:
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* caller needs: none
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* taken: none
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* held on exit: none
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* returns: DLM_NORMAL, DLM_NOLOCKMGR, status from network
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*/
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static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm,
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struct dlm_lock_resource *res,
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struct dlm_lock *lock,
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struct dlm_lockstatus *lksb,
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int flags,
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u8 owner)
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{
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struct dlm_unlock_lock unlock;
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int tmpret;
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enum dlm_status ret;
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int status = 0;
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struct kvec vec[2];
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size_t veclen = 1;
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mlog(0, "%.*s\n", res->lockname.len, res->lockname.name);
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if (owner == dlm->node_num) {
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/* ended up trying to contact ourself. this means
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* that the lockres had been remote but became local
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* via a migration. just retry it, now as local */
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mlog(0, "%s:%.*s: this node became the master due to a "
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"migration, re-evaluate now\n", dlm->name,
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res->lockname.len, res->lockname.name);
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return DLM_FORWARD;
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}
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memset(&unlock, 0, sizeof(unlock));
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unlock.node_idx = dlm->node_num;
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unlock.flags = cpu_to_be32(flags);
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unlock.cookie = lock->ml.cookie;
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unlock.namelen = res->lockname.len;
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memcpy(unlock.name, res->lockname.name, unlock.namelen);
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vec[0].iov_len = sizeof(struct dlm_unlock_lock);
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vec[0].iov_base = &unlock;
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if (flags & LKM_PUT_LVB) {
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/* extra data to send if we are updating lvb */
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vec[1].iov_len = DLM_LVB_LEN;
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vec[1].iov_base = lock->lksb->lvb;
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veclen++;
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}
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tmpret = o2net_send_message_vec(DLM_UNLOCK_LOCK_MSG, dlm->key,
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vec, veclen, owner, &status);
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if (tmpret >= 0) {
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// successfully sent and received
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if (status == DLM_FORWARD)
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mlog(0, "master was in-progress. retry\n");
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ret = status;
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} else {
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mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to "
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"node %u\n", tmpret, DLM_UNLOCK_LOCK_MSG, dlm->key, owner);
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if (dlm_is_host_down(tmpret)) {
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/* NOTE: this seems strange, but it is what we want.
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* when the master goes down during a cancel or
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* unlock, the recovery code completes the operation
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* as if the master had not died, then passes the
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* updated state to the recovery master. this thread
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* just needs to finish out the operation and call
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* the unlockast. */
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if (dlm_is_node_dead(dlm, owner))
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ret = DLM_NORMAL;
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else
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ret = DLM_NOLOCKMGR;
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} else {
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/* something bad. this will BUG in ocfs2 */
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ret = dlm_err_to_dlm_status(tmpret);
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}
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}
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return ret;
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}
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/*
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* locking:
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* caller needs: none
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* taken: takes and drops res->spinlock
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* held on exit: none
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* returns: DLM_NORMAL, DLM_BADARGS, DLM_IVLOCKID,
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* return value from dlmunlock_master
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*/
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int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data,
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void **ret_data)
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{
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struct dlm_ctxt *dlm = data;
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struct dlm_unlock_lock *unlock = (struct dlm_unlock_lock *)msg->buf;
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struct dlm_lock_resource *res = NULL;
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struct dlm_lock *lock = NULL;
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enum dlm_status status = DLM_NORMAL;
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int found = 0, i;
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struct dlm_lockstatus *lksb = NULL;
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int ignore;
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u32 flags;
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struct list_head *queue;
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flags = be32_to_cpu(unlock->flags);
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if (flags & LKM_GET_LVB) {
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mlog(ML_ERROR, "bad args! GET_LVB specified on unlock!\n");
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return DLM_BADARGS;
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}
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if ((flags & (LKM_PUT_LVB|LKM_CANCEL)) == (LKM_PUT_LVB|LKM_CANCEL)) {
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mlog(ML_ERROR, "bad args! cannot modify lvb on a CANCEL "
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"request!\n");
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return DLM_BADARGS;
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}
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if (unlock->namelen > DLM_LOCKID_NAME_MAX) {
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mlog(ML_ERROR, "Invalid name length in unlock handler!\n");
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return DLM_IVBUFLEN;
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}
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if (!dlm_grab(dlm))
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return DLM_FORWARD;
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mlog_bug_on_msg(!dlm_domain_fully_joined(dlm),
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"Domain %s not fully joined!\n", dlm->name);
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mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" : "none");
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res = dlm_lookup_lockres(dlm, unlock->name, unlock->namelen);
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if (!res) {
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/* We assume here that a no lock resource simply means
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* it was migrated away and destroyed before the other
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* node could detect it. */
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mlog(0, "returning DLM_FORWARD -- res no longer exists\n");
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status = DLM_FORWARD;
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goto not_found;
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}
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queue=&res->granted;
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found = 0;
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spin_lock(&res->spinlock);
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if (res->state & DLM_LOCK_RES_RECOVERING) {
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spin_unlock(&res->spinlock);
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mlog(0, "returning DLM_RECOVERING\n");
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status = DLM_RECOVERING;
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goto leave;
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}
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if (res->state & DLM_LOCK_RES_MIGRATING) {
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spin_unlock(&res->spinlock);
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mlog(0, "returning DLM_MIGRATING\n");
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status = DLM_MIGRATING;
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goto leave;
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}
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if (res->owner != dlm->node_num) {
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spin_unlock(&res->spinlock);
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mlog(0, "returning DLM_FORWARD -- not master\n");
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status = DLM_FORWARD;
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goto leave;
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}
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for (i=0; i<3; i++) {
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list_for_each_entry(lock, queue, list) {
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if (lock->ml.cookie == unlock->cookie &&
|
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lock->ml.node == unlock->node_idx) {
|
|
dlm_lock_get(lock);
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
if (found)
|
|
break;
|
|
/* scan granted -> converting -> blocked queues */
|
|
queue++;
|
|
}
|
|
spin_unlock(&res->spinlock);
|
|
if (!found) {
|
|
status = DLM_IVLOCKID;
|
|
goto not_found;
|
|
}
|
|
|
|
/* lock was found on queue */
|
|
lksb = lock->lksb;
|
|
if (flags & (LKM_VALBLK|LKM_PUT_LVB) &&
|
|
lock->ml.type != LKM_EXMODE)
|
|
flags &= ~(LKM_VALBLK|LKM_PUT_LVB);
|
|
|
|
/* unlockast only called on originating node */
|
|
if (flags & LKM_PUT_LVB) {
|
|
lksb->flags |= DLM_LKSB_PUT_LVB;
|
|
memcpy(&lksb->lvb[0], &unlock->lvb[0], DLM_LVB_LEN);
|
|
}
|
|
|
|
/* if this is in-progress, propagate the DLM_FORWARD
|
|
* all the way back out */
|
|
status = dlmunlock_master(dlm, res, lock, lksb, flags, &ignore);
|
|
if (status == DLM_FORWARD)
|
|
mlog(0, "lockres is in progress\n");
|
|
|
|
if (flags & LKM_PUT_LVB)
|
|
lksb->flags &= ~DLM_LKSB_PUT_LVB;
|
|
|
|
dlm_lockres_calc_usage(dlm, res);
|
|
dlm_kick_thread(dlm, res);
|
|
|
|
not_found:
|
|
if (!found)
|
|
mlog(ML_ERROR, "failed to find lock to unlock! "
|
|
"cookie=%u:%llu\n",
|
|
dlm_get_lock_cookie_node(be64_to_cpu(unlock->cookie)),
|
|
dlm_get_lock_cookie_seq(be64_to_cpu(unlock->cookie)));
|
|
else
|
|
dlm_lock_put(lock);
|
|
|
|
leave:
|
|
if (res)
|
|
dlm_lockres_put(res);
|
|
|
|
dlm_put(dlm);
|
|
|
|
return status;
|
|
}
|
|
|
|
|
|
static enum dlm_status dlm_get_cancel_actions(struct dlm_ctxt *dlm,
|
|
struct dlm_lock_resource *res,
|
|
struct dlm_lock *lock,
|
|
struct dlm_lockstatus *lksb,
|
|
int *actions)
|
|
{
|
|
enum dlm_status status;
|
|
|
|
if (dlm_lock_on_list(&res->blocked, lock)) {
|
|
/* cancel this outright */
|
|
status = DLM_NORMAL;
|
|
*actions = (DLM_UNLOCK_CALL_AST |
|
|
DLM_UNLOCK_REMOVE_LOCK);
|
|
} else if (dlm_lock_on_list(&res->converting, lock)) {
|
|
/* cancel the request, put back on granted */
|
|
status = DLM_NORMAL;
|
|
*actions = (DLM_UNLOCK_CALL_AST |
|
|
DLM_UNLOCK_REMOVE_LOCK |
|
|
DLM_UNLOCK_REGRANT_LOCK |
|
|
DLM_UNLOCK_CLEAR_CONVERT_TYPE);
|
|
} else if (dlm_lock_on_list(&res->granted, lock)) {
|
|
/* too late, already granted. */
|
|
status = DLM_CANCELGRANT;
|
|
*actions = DLM_UNLOCK_CALL_AST;
|
|
} else {
|
|
mlog(ML_ERROR, "lock to cancel is not on any list!\n");
|
|
status = DLM_IVLOCKID;
|
|
*actions = 0;
|
|
}
|
|
return status;
|
|
}
|
|
|
|
static enum dlm_status dlm_get_unlock_actions(struct dlm_ctxt *dlm,
|
|
struct dlm_lock_resource *res,
|
|
struct dlm_lock *lock,
|
|
struct dlm_lockstatus *lksb,
|
|
int *actions)
|
|
{
|
|
enum dlm_status status;
|
|
|
|
/* unlock request */
|
|
if (!dlm_lock_on_list(&res->granted, lock)) {
|
|
status = DLM_DENIED;
|
|
dlm_error(status);
|
|
*actions = 0;
|
|
} else {
|
|
/* unlock granted lock */
|
|
status = DLM_NORMAL;
|
|
*actions = (DLM_UNLOCK_FREE_LOCK |
|
|
DLM_UNLOCK_CALL_AST |
|
|
DLM_UNLOCK_REMOVE_LOCK);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
/* there seems to be no point in doing this async
|
|
* since (even for the remote case) there is really
|
|
* no work to queue up... so just do it and fire the
|
|
* unlockast by hand when done... */
|
|
enum dlm_status dlmunlock(struct dlm_ctxt *dlm, struct dlm_lockstatus *lksb,
|
|
int flags, dlm_astunlockfunc_t *unlockast, void *data)
|
|
{
|
|
enum dlm_status status;
|
|
struct dlm_lock_resource *res;
|
|
struct dlm_lock *lock = NULL;
|
|
int call_ast, is_master;
|
|
|
|
if (!lksb) {
|
|
dlm_error(DLM_BADARGS);
|
|
return DLM_BADARGS;
|
|
}
|
|
|
|
if (flags & ~(LKM_CANCEL | LKM_VALBLK | LKM_INVVALBLK)) {
|
|
dlm_error(DLM_BADPARAM);
|
|
return DLM_BADPARAM;
|
|
}
|
|
|
|
if ((flags & (LKM_VALBLK | LKM_CANCEL)) == (LKM_VALBLK | LKM_CANCEL)) {
|
|
mlog(0, "VALBLK given with CANCEL: ignoring VALBLK\n");
|
|
flags &= ~LKM_VALBLK;
|
|
}
|
|
|
|
if (!lksb->lockid || !lksb->lockid->lockres) {
|
|
dlm_error(DLM_BADPARAM);
|
|
return DLM_BADPARAM;
|
|
}
|
|
|
|
lock = lksb->lockid;
|
|
BUG_ON(!lock);
|
|
dlm_lock_get(lock);
|
|
|
|
res = lock->lockres;
|
|
BUG_ON(!res);
|
|
dlm_lockres_get(res);
|
|
retry:
|
|
call_ast = 0;
|
|
/* need to retry up here because owner may have changed */
|
|
mlog(0, "lock=%p res=%p\n", lock, res);
|
|
|
|
spin_lock(&res->spinlock);
|
|
is_master = (res->owner == dlm->node_num);
|
|
if (flags & LKM_VALBLK && lock->ml.type != LKM_EXMODE)
|
|
flags &= ~LKM_VALBLK;
|
|
spin_unlock(&res->spinlock);
|
|
|
|
if (is_master) {
|
|
status = dlmunlock_master(dlm, res, lock, lksb, flags,
|
|
&call_ast);
|
|
mlog(0, "done calling dlmunlock_master: returned %d, "
|
|
"call_ast is %d\n", status, call_ast);
|
|
} else {
|
|
status = dlmunlock_remote(dlm, res, lock, lksb, flags,
|
|
&call_ast);
|
|
mlog(0, "done calling dlmunlock_remote: returned %d, "
|
|
"call_ast is %d\n", status, call_ast);
|
|
}
|
|
|
|
if (status == DLM_RECOVERING ||
|
|
status == DLM_MIGRATING ||
|
|
status == DLM_FORWARD ||
|
|
status == DLM_NOLOCKMGR) {
|
|
|
|
/* We want to go away for a tiny bit to allow recovery
|
|
* / migration to complete on this resource. I don't
|
|
* know of any wait queue we could sleep on as this
|
|
* may be happening on another node. Perhaps the
|
|
* proper solution is to queue up requests on the
|
|
* other end? */
|
|
|
|
/* do we want to yield(); ?? */
|
|
msleep(50);
|
|
|
|
mlog(0, "retrying unlock due to pending recovery/"
|
|
"migration/in-progress/reconnect\n");
|
|
goto retry;
|
|
}
|
|
|
|
if (call_ast) {
|
|
mlog(0, "calling unlockast(%p, %d)\n", data, status);
|
|
if (is_master) {
|
|
/* it is possible that there is one last bast
|
|
* pending. make sure it is flushed, then
|
|
* call the unlockast.
|
|
* not an issue if this is a mastered remotely,
|
|
* since this lock has been removed from the
|
|
* lockres queues and cannot be found. */
|
|
dlm_kick_thread(dlm, NULL);
|
|
wait_event(dlm->ast_wq,
|
|
dlm_lock_basts_flushed(dlm, lock));
|
|
}
|
|
(*unlockast)(data, status);
|
|
}
|
|
|
|
if (status == DLM_CANCELGRANT)
|
|
status = DLM_NORMAL;
|
|
|
|
if (status == DLM_NORMAL) {
|
|
mlog(0, "kicking the thread\n");
|
|
dlm_kick_thread(dlm, res);
|
|
} else
|
|
dlm_error(status);
|
|
|
|
dlm_lockres_calc_usage(dlm, res);
|
|
dlm_lockres_put(res);
|
|
dlm_lock_put(lock);
|
|
|
|
mlog(0, "returning status=%d!\n", status);
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dlmunlock);
|
|
|