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698 lines
19 KiB
698 lines
19 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* -*- 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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#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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int recovery_wait = 0; |
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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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if (!lock->unlock_pending) |
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recovery_wait = 1; |
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else |
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lock->unlock_pending = 0; |
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} |
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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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if (recovery_wait) { |
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spin_lock(&res->spinlock); |
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/* Unlock request will directly succeed after owner dies, |
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* and the lock is already removed from grant list. We have to |
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* wait for RECOVERING done or we miss the chance to purge it |
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* since the removement is much faster than RECOVERING proc. |
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*/ |
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__dlm_wait_on_lockres_flags(res, DLM_LOCK_RES_RECOVERING); |
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spin_unlock(&res->spinlock); |
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} |
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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) { |
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dlm_lock_get(lock); |
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found = 1; |
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break; |
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} |
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} |
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if (found) |
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break; |
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/* scan granted -> converting -> blocked queues */ |
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queue++; |
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} |
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spin_unlock(&res->spinlock); |
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if (!found) { |
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status = DLM_IVLOCKID; |
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goto not_found; |
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} |
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/* lock was found on queue */ |
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lksb = lock->lksb; |
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if (flags & (LKM_VALBLK|LKM_PUT_LVB) && |
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lock->ml.type != LKM_EXMODE) |
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flags &= ~(LKM_VALBLK|LKM_PUT_LVB); |
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|
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/* unlockast only called on originating node */ |
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if (flags & LKM_PUT_LVB) { |
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lksb->flags |= DLM_LKSB_PUT_LVB; |
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memcpy(&lksb->lvb[0], &unlock->lvb[0], DLM_LVB_LEN); |
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} |
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|
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/* if this is in-progress, propagate the DLM_FORWARD |
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* all the way back out */ |
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status = dlmunlock_master(dlm, res, lock, lksb, flags, &ignore); |
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if (status == DLM_FORWARD) |
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mlog(0, "lockres is in progress\n"); |
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|
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if (flags & LKM_PUT_LVB) |
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lksb->flags &= ~DLM_LKSB_PUT_LVB; |
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|
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dlm_lockres_calc_usage(dlm, res); |
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dlm_kick_thread(dlm, res); |
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|
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not_found: |
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if (!found) |
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mlog(ML_ERROR, "failed to find lock to unlock! " |
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"cookie=%u:%llu\n", |
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dlm_get_lock_cookie_node(be64_to_cpu(unlock->cookie)), |
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dlm_get_lock_cookie_seq(be64_to_cpu(unlock->cookie))); |
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else |
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dlm_lock_put(lock); |
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|
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leave: |
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if (res) |
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dlm_lockres_put(res); |
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|
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dlm_put(dlm); |
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|
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return status; |
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} |
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|
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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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{ |
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enum dlm_status status; |
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|
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if (dlm_lock_on_list(&res->blocked, lock)) { |
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/* cancel this outright */ |
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status = DLM_NORMAL; |
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*actions = (DLM_UNLOCK_CALL_AST | |
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DLM_UNLOCK_REMOVE_LOCK); |
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} 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); |
|
|
|
|