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![Julia Lawall](/assets/img/avatar_default.png)
Memory allocated using kmem_cache_zalloc should be freed using kmem_cache_free, not kfree. The semantic patch that fixes this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression x,e,e1,e2; @@ x = kmem_cache_zalloc(e1,e2) ... when != x = e ?-kfree(x) +kmem_cache_free(e1,x) // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Joel Becker <jlbec@evilplan.org>
765 lines
20 KiB
C
765 lines
20 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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* dlmlock.c
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*
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* underlying calls for lock creation
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*
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* Copyright (C) 2004 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/highmem.h>
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#include <linux/init.h>
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#include <linux/sysctl.h>
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#include <linux/random.h>
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#include <linux/blkdev.h>
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#include <linux/socket.h>
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#include <linux/inet.h>
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#include <linux/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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#include "dlmconvert.h"
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#define MLOG_MASK_PREFIX ML_DLM
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#include "cluster/masklog.h"
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static struct kmem_cache *dlm_lock_cache = NULL;
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static DEFINE_SPINLOCK(dlm_cookie_lock);
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static u64 dlm_next_cookie = 1;
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static enum dlm_status dlm_send_remote_lock_request(struct dlm_ctxt *dlm,
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struct dlm_lock_resource *res,
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struct dlm_lock *lock, int flags);
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static void dlm_init_lock(struct dlm_lock *newlock, int type,
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u8 node, u64 cookie);
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static void dlm_lock_release(struct kref *kref);
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static void dlm_lock_detach_lockres(struct dlm_lock *lock);
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int dlm_init_lock_cache(void)
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{
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dlm_lock_cache = kmem_cache_create("o2dlm_lock",
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sizeof(struct dlm_lock),
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0, SLAB_HWCACHE_ALIGN, NULL);
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if (dlm_lock_cache == NULL)
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return -ENOMEM;
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return 0;
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}
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void dlm_destroy_lock_cache(void)
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{
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if (dlm_lock_cache)
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kmem_cache_destroy(dlm_lock_cache);
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}
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/* Tell us whether we can grant a new lock request.
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* locking:
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* caller needs: res->spinlock
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* taken: none
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* held on exit: none
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* returns: 1 if the lock can be granted, 0 otherwise.
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*/
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static int dlm_can_grant_new_lock(struct dlm_lock_resource *res,
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struct dlm_lock *lock)
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{
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struct list_head *iter;
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struct dlm_lock *tmplock;
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list_for_each(iter, &res->granted) {
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tmplock = list_entry(iter, struct dlm_lock, list);
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if (!dlm_lock_compatible(tmplock->ml.type, lock->ml.type))
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return 0;
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}
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list_for_each(iter, &res->converting) {
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tmplock = list_entry(iter, struct dlm_lock, list);
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if (!dlm_lock_compatible(tmplock->ml.type, lock->ml.type))
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return 0;
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if (!dlm_lock_compatible(tmplock->ml.convert_type,
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lock->ml.type))
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return 0;
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}
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return 1;
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}
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/* performs lock creation at the lockres master site
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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_NOTQUEUED
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*/
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static enum dlm_status dlmlock_master(struct dlm_ctxt *dlm,
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struct dlm_lock_resource *res,
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struct dlm_lock *lock, int flags)
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{
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int call_ast = 0, kick_thread = 0;
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enum dlm_status status = DLM_NORMAL;
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mlog(0, "type=%d\n", lock->ml.type);
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spin_lock(&res->spinlock);
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/* if called from dlm_create_lock_handler, need to
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* ensure it will not sleep in dlm_wait_on_lockres */
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status = __dlm_lockres_state_to_status(res);
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if (status != DLM_NORMAL &&
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lock->ml.node != dlm->node_num) {
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/* erf. state changed after lock was dropped. */
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spin_unlock(&res->spinlock);
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dlm_error(status);
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return status;
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}
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__dlm_wait_on_lockres(res);
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__dlm_lockres_reserve_ast(res);
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if (dlm_can_grant_new_lock(res, lock)) {
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mlog(0, "I can grant this lock right away\n");
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/* got it right away */
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lock->lksb->status = DLM_NORMAL;
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status = DLM_NORMAL;
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dlm_lock_get(lock);
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list_add_tail(&lock->list, &res->granted);
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/* for the recovery lock, we can't allow the ast
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* to be queued since the dlmthread is already
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* frozen. but the recovery lock is always locked
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* with LKM_NOQUEUE so we do not need the ast in
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* this special case */
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if (!dlm_is_recovery_lock(res->lockname.name,
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res->lockname.len)) {
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kick_thread = 1;
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call_ast = 1;
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} else {
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mlog(0, "%s: returning DLM_NORMAL to "
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"node %u for reco lock\n", dlm->name,
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lock->ml.node);
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}
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} else {
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/* for NOQUEUE request, unless we get the
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* lock right away, return DLM_NOTQUEUED */
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if (flags & LKM_NOQUEUE) {
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status = DLM_NOTQUEUED;
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if (dlm_is_recovery_lock(res->lockname.name,
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res->lockname.len)) {
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mlog(0, "%s: returning NOTQUEUED to "
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"node %u for reco lock\n", dlm->name,
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lock->ml.node);
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}
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} else {
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dlm_lock_get(lock);
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list_add_tail(&lock->list, &res->blocked);
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kick_thread = 1;
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}
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}
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spin_unlock(&res->spinlock);
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wake_up(&res->wq);
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/* either queue the ast or release it */
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if (call_ast)
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dlm_queue_ast(dlm, lock);
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else
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dlm_lockres_release_ast(dlm, res);
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dlm_lockres_calc_usage(dlm, res);
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if (kick_thread)
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dlm_kick_thread(dlm, res);
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return status;
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}
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void dlm_revert_pending_lock(struct dlm_lock_resource *res,
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struct dlm_lock *lock)
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{
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/* remove from local queue if it failed */
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list_del_init(&lock->list);
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lock->lksb->flags &= ~DLM_LKSB_GET_LVB;
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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_DENIED, DLM_RECOVERING, or net status
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*/
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static enum dlm_status dlmlock_remote(struct dlm_ctxt *dlm,
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struct dlm_lock_resource *res,
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struct dlm_lock *lock, int flags)
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{
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enum dlm_status status = DLM_DENIED;
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int lockres_changed = 1;
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mlog(0, "type=%d, lockres %.*s, flags = 0x%x\n",
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lock->ml.type, res->lockname.len,
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res->lockname.name, flags);
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/*
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* Wait if resource is getting recovered, remastered, etc.
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* If the resource was remastered and new owner is self, then exit.
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*/
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spin_lock(&res->spinlock);
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__dlm_wait_on_lockres(res);
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if (res->owner == dlm->node_num) {
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spin_unlock(&res->spinlock);
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return DLM_RECOVERING;
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}
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res->state |= DLM_LOCK_RES_IN_PROGRESS;
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/* add lock to local (secondary) queue */
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dlm_lock_get(lock);
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list_add_tail(&lock->list, &res->blocked);
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lock->lock_pending = 1;
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spin_unlock(&res->spinlock);
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/* spec seems to say that you will get DLM_NORMAL when the lock
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* has been queued, meaning we need to wait for a reply here. */
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status = dlm_send_remote_lock_request(dlm, res, lock, flags);
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spin_lock(&res->spinlock);
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res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
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lock->lock_pending = 0;
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if (status != DLM_NORMAL) {
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if (status == DLM_RECOVERING &&
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dlm_is_recovery_lock(res->lockname.name,
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res->lockname.len)) {
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/* recovery lock was mastered by dead node.
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* we need to have calc_usage shoot down this
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* lockres and completely remaster it. */
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mlog(0, "%s: recovery lock was owned by "
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"dead node %u, remaster it now.\n",
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dlm->name, res->owner);
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} else if (status != DLM_NOTQUEUED) {
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/*
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* DO NOT call calc_usage, as this would unhash
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* the remote lockres before we ever get to use
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* it. treat as if we never made any change to
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* the lockres.
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*/
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lockres_changed = 0;
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dlm_error(status);
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}
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dlm_revert_pending_lock(res, lock);
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dlm_lock_put(lock);
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} else if (dlm_is_recovery_lock(res->lockname.name,
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res->lockname.len)) {
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/* special case for the $RECOVERY lock.
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* there will never be an AST delivered to put
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* this lock on the proper secondary queue
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* (granted), so do it manually. */
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mlog(0, "%s: $RECOVERY lock for this node (%u) is "
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"mastered by %u; got lock, manually granting (no ast)\n",
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dlm->name, dlm->node_num, res->owner);
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list_move_tail(&lock->list, &res->granted);
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}
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spin_unlock(&res->spinlock);
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if (lockres_changed)
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dlm_lockres_calc_usage(dlm, res);
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wake_up(&res->wq);
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return status;
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}
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/* for remote lock creation.
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* locking:
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* caller needs: none, but need res->state & DLM_LOCK_RES_IN_PROGRESS
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* taken: none
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* held on exit: none
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* returns: DLM_NOLOCKMGR, or net status
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*/
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static enum dlm_status dlm_send_remote_lock_request(struct dlm_ctxt *dlm,
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struct dlm_lock_resource *res,
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struct dlm_lock *lock, int flags)
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{
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struct dlm_create_lock create;
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int tmpret, status = 0;
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enum dlm_status ret;
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memset(&create, 0, sizeof(create));
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create.node_idx = dlm->node_num;
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create.requested_type = lock->ml.type;
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create.cookie = lock->ml.cookie;
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create.namelen = res->lockname.len;
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create.flags = cpu_to_be32(flags);
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memcpy(create.name, res->lockname.name, create.namelen);
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tmpret = o2net_send_message(DLM_CREATE_LOCK_MSG, dlm->key, &create,
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sizeof(create), res->owner, &status);
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if (tmpret >= 0) {
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ret = status;
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if (ret == DLM_REJECTED) {
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mlog(ML_ERROR, "%s: res %.*s, Stale lockres no longer "
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"owned by node %u. That node is coming back up "
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"currently.\n", dlm->name, create.namelen,
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create.name, res->owner);
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dlm_print_one_lock_resource(res);
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BUG();
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}
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} else {
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mlog(ML_ERROR, "%s: res %.*s, Error %d send CREATE LOCK to "
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"node %u\n", dlm->name, create.namelen, create.name,
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tmpret, res->owner);
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if (dlm_is_host_down(tmpret))
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ret = DLM_RECOVERING;
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else
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ret = dlm_err_to_dlm_status(tmpret);
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}
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return ret;
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}
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void dlm_lock_get(struct dlm_lock *lock)
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{
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kref_get(&lock->lock_refs);
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}
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void dlm_lock_put(struct dlm_lock *lock)
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{
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kref_put(&lock->lock_refs, dlm_lock_release);
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}
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static void dlm_lock_release(struct kref *kref)
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{
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struct dlm_lock *lock;
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lock = container_of(kref, struct dlm_lock, lock_refs);
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BUG_ON(!list_empty(&lock->list));
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BUG_ON(!list_empty(&lock->ast_list));
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BUG_ON(!list_empty(&lock->bast_list));
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BUG_ON(lock->ast_pending);
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BUG_ON(lock->bast_pending);
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dlm_lock_detach_lockres(lock);
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if (lock->lksb_kernel_allocated) {
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mlog(0, "freeing kernel-allocated lksb\n");
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kfree(lock->lksb);
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}
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kmem_cache_free(dlm_lock_cache, lock);
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}
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/* associate a lock with it's lockres, getting a ref on the lockres */
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void dlm_lock_attach_lockres(struct dlm_lock *lock,
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struct dlm_lock_resource *res)
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{
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dlm_lockres_get(res);
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lock->lockres = res;
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}
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/* drop ref on lockres, if there is still one associated with lock */
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static void dlm_lock_detach_lockres(struct dlm_lock *lock)
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{
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struct dlm_lock_resource *res;
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res = lock->lockres;
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if (res) {
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lock->lockres = NULL;
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mlog(0, "removing lock's lockres reference\n");
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dlm_lockres_put(res);
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}
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}
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static void dlm_init_lock(struct dlm_lock *newlock, int type,
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u8 node, u64 cookie)
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{
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INIT_LIST_HEAD(&newlock->list);
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INIT_LIST_HEAD(&newlock->ast_list);
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INIT_LIST_HEAD(&newlock->bast_list);
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spin_lock_init(&newlock->spinlock);
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newlock->ml.type = type;
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newlock->ml.convert_type = LKM_IVMODE;
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newlock->ml.highest_blocked = LKM_IVMODE;
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newlock->ml.node = node;
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newlock->ml.pad1 = 0;
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newlock->ml.list = 0;
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newlock->ml.flags = 0;
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newlock->ast = NULL;
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newlock->bast = NULL;
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newlock->astdata = NULL;
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newlock->ml.cookie = cpu_to_be64(cookie);
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newlock->ast_pending = 0;
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newlock->bast_pending = 0;
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newlock->convert_pending = 0;
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newlock->lock_pending = 0;
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newlock->unlock_pending = 0;
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newlock->cancel_pending = 0;
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newlock->lksb_kernel_allocated = 0;
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kref_init(&newlock->lock_refs);
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}
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struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie,
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struct dlm_lockstatus *lksb)
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{
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struct dlm_lock *lock;
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int kernel_allocated = 0;
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lock = kmem_cache_zalloc(dlm_lock_cache, GFP_NOFS);
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if (!lock)
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return NULL;
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if (!lksb) {
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/* zero memory only if kernel-allocated */
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lksb = kzalloc(sizeof(*lksb), GFP_NOFS);
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if (!lksb) {
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kmem_cache_free(dlm_lock_cache, lock);
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return NULL;
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}
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kernel_allocated = 1;
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}
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dlm_init_lock(lock, type, node, cookie);
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if (kernel_allocated)
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lock->lksb_kernel_allocated = 1;
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lock->lksb = lksb;
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lksb->lockid = lock;
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return lock;
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}
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/* handler for lock creation net message
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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_SYSERR, DLM_IVLOCKID, DLM_NOTQUEUED
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*/
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int dlm_create_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_create_lock *create = (struct dlm_create_lock *)msg->buf;
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struct dlm_lock_resource *res = NULL;
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struct dlm_lock *newlock = NULL;
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struct dlm_lockstatus *lksb = NULL;
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enum dlm_status status = DLM_NORMAL;
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char *name;
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unsigned int namelen;
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BUG_ON(!dlm);
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if (!dlm_grab(dlm))
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return DLM_REJECTED;
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name = create->name;
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namelen = create->namelen;
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status = DLM_REJECTED;
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if (!dlm_domain_fully_joined(dlm)) {
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mlog(ML_ERROR, "Domain %s not fully joined, but node %u is "
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|
"sending a create_lock message for lock %.*s!\n",
|
|
dlm->name, create->node_idx, namelen, name);
|
|
dlm_error(status);
|
|
goto leave;
|
|
}
|
|
|
|
status = DLM_IVBUFLEN;
|
|
if (namelen > DLM_LOCKID_NAME_MAX) {
|
|
dlm_error(status);
|
|
goto leave;
|
|
}
|
|
|
|
status = DLM_SYSERR;
|
|
newlock = dlm_new_lock(create->requested_type,
|
|
create->node_idx,
|
|
be64_to_cpu(create->cookie), NULL);
|
|
if (!newlock) {
|
|
dlm_error(status);
|
|
goto leave;
|
|
}
|
|
|
|
lksb = newlock->lksb;
|
|
|
|
if (be32_to_cpu(create->flags) & LKM_GET_LVB) {
|
|
lksb->flags |= DLM_LKSB_GET_LVB;
|
|
mlog(0, "set DLM_LKSB_GET_LVB flag\n");
|
|
}
|
|
|
|
status = DLM_IVLOCKID;
|
|
res = dlm_lookup_lockres(dlm, name, namelen);
|
|
if (!res) {
|
|
dlm_error(status);
|
|
goto leave;
|
|
}
|
|
|
|
spin_lock(&res->spinlock);
|
|
status = __dlm_lockres_state_to_status(res);
|
|
spin_unlock(&res->spinlock);
|
|
|
|
if (status != DLM_NORMAL) {
|
|
mlog(0, "lockres recovering/migrating/in-progress\n");
|
|
goto leave;
|
|
}
|
|
|
|
dlm_lock_attach_lockres(newlock, res);
|
|
|
|
status = dlmlock_master(dlm, res, newlock, be32_to_cpu(create->flags));
|
|
leave:
|
|
if (status != DLM_NORMAL)
|
|
if (newlock)
|
|
dlm_lock_put(newlock);
|
|
|
|
if (res)
|
|
dlm_lockres_put(res);
|
|
|
|
dlm_put(dlm);
|
|
|
|
return status;
|
|
}
|
|
|
|
|
|
/* fetch next node-local (u8 nodenum + u56 cookie) into u64 */
|
|
static inline void dlm_get_next_cookie(u8 node_num, u64 *cookie)
|
|
{
|
|
u64 tmpnode = node_num;
|
|
|
|
/* shift single byte of node num into top 8 bits */
|
|
tmpnode <<= 56;
|
|
|
|
spin_lock(&dlm_cookie_lock);
|
|
*cookie = (dlm_next_cookie | tmpnode);
|
|
if (++dlm_next_cookie & 0xff00000000000000ull) {
|
|
mlog(0, "This node's cookie will now wrap!\n");
|
|
dlm_next_cookie = 1;
|
|
}
|
|
spin_unlock(&dlm_cookie_lock);
|
|
}
|
|
|
|
enum dlm_status dlmlock(struct dlm_ctxt *dlm, int mode,
|
|
struct dlm_lockstatus *lksb, int flags,
|
|
const char *name, int namelen, dlm_astlockfunc_t *ast,
|
|
void *data, dlm_bastlockfunc_t *bast)
|
|
{
|
|
enum dlm_status status;
|
|
struct dlm_lock_resource *res = NULL;
|
|
struct dlm_lock *lock = NULL;
|
|
int convert = 0, recovery = 0;
|
|
|
|
/* yes this function is a mess.
|
|
* TODO: clean this up. lots of common code in the
|
|
* lock and convert paths, especially in the retry blocks */
|
|
if (!lksb) {
|
|
dlm_error(DLM_BADARGS);
|
|
return DLM_BADARGS;
|
|
}
|
|
|
|
status = DLM_BADPARAM;
|
|
if (mode != LKM_EXMODE && mode != LKM_PRMODE && mode != LKM_NLMODE) {
|
|
dlm_error(status);
|
|
goto error;
|
|
}
|
|
|
|
if (flags & ~LKM_VALID_FLAGS) {
|
|
dlm_error(status);
|
|
goto error;
|
|
}
|
|
|
|
convert = (flags & LKM_CONVERT);
|
|
recovery = (flags & LKM_RECOVERY);
|
|
|
|
if (recovery &&
|
|
(!dlm_is_recovery_lock(name, namelen) || convert) ) {
|
|
dlm_error(status);
|
|
goto error;
|
|
}
|
|
if (convert && (flags & LKM_LOCAL)) {
|
|
mlog(ML_ERROR, "strange LOCAL convert request!\n");
|
|
goto error;
|
|
}
|
|
|
|
if (convert) {
|
|
/* CONVERT request */
|
|
|
|
/* if converting, must pass in a valid dlm_lock */
|
|
lock = lksb->lockid;
|
|
if (!lock) {
|
|
mlog(ML_ERROR, "NULL lock pointer in convert "
|
|
"request\n");
|
|
goto error;
|
|
}
|
|
|
|
res = lock->lockres;
|
|
if (!res) {
|
|
mlog(ML_ERROR, "NULL lockres pointer in convert "
|
|
"request\n");
|
|
goto error;
|
|
}
|
|
dlm_lockres_get(res);
|
|
|
|
/* XXX: for ocfs2 purposes, the ast/bast/astdata/lksb are
|
|
* static after the original lock call. convert requests will
|
|
* ensure that everything is the same, or return DLM_BADARGS.
|
|
* this means that DLM_DENIED_NOASTS will never be returned.
|
|
*/
|
|
if (lock->lksb != lksb || lock->ast != ast ||
|
|
lock->bast != bast || lock->astdata != data) {
|
|
status = DLM_BADARGS;
|
|
mlog(ML_ERROR, "new args: lksb=%p, ast=%p, bast=%p, "
|
|
"astdata=%p\n", lksb, ast, bast, data);
|
|
mlog(ML_ERROR, "orig args: lksb=%p, ast=%p, bast=%p, "
|
|
"astdata=%p\n", lock->lksb, lock->ast,
|
|
lock->bast, lock->astdata);
|
|
goto error;
|
|
}
|
|
retry_convert:
|
|
dlm_wait_for_recovery(dlm);
|
|
|
|
if (res->owner == dlm->node_num)
|
|
status = dlmconvert_master(dlm, res, lock, flags, mode);
|
|
else
|
|
status = dlmconvert_remote(dlm, res, lock, flags, mode);
|
|
if (status == DLM_RECOVERING || status == DLM_MIGRATING ||
|
|
status == DLM_FORWARD) {
|
|
/* for now, see how this works without sleeping
|
|
* and just retry right away. I suspect the reco
|
|
* or migration will complete fast enough that
|
|
* no waiting will be necessary */
|
|
mlog(0, "retrying convert with migration/recovery/"
|
|
"in-progress\n");
|
|
msleep(100);
|
|
goto retry_convert;
|
|
}
|
|
} else {
|
|
u64 tmpcookie;
|
|
|
|
/* LOCK request */
|
|
status = DLM_BADARGS;
|
|
if (!name) {
|
|
dlm_error(status);
|
|
goto error;
|
|
}
|
|
|
|
status = DLM_IVBUFLEN;
|
|
if (namelen > DLM_LOCKID_NAME_MAX || namelen < 1) {
|
|
dlm_error(status);
|
|
goto error;
|
|
}
|
|
|
|
dlm_get_next_cookie(dlm->node_num, &tmpcookie);
|
|
lock = dlm_new_lock(mode, dlm->node_num, tmpcookie, lksb);
|
|
if (!lock) {
|
|
dlm_error(status);
|
|
goto error;
|
|
}
|
|
|
|
if (!recovery)
|
|
dlm_wait_for_recovery(dlm);
|
|
|
|
/* find or create the lock resource */
|
|
res = dlm_get_lock_resource(dlm, name, namelen, flags);
|
|
if (!res) {
|
|
status = DLM_IVLOCKID;
|
|
dlm_error(status);
|
|
goto error;
|
|
}
|
|
|
|
mlog(0, "type=%d, flags = 0x%x\n", mode, flags);
|
|
mlog(0, "creating lock: lock=%p res=%p\n", lock, res);
|
|
|
|
dlm_lock_attach_lockres(lock, res);
|
|
lock->ast = ast;
|
|
lock->bast = bast;
|
|
lock->astdata = data;
|
|
|
|
retry_lock:
|
|
if (flags & LKM_VALBLK) {
|
|
mlog(0, "LKM_VALBLK passed by caller\n");
|
|
|
|
/* LVB requests for non PR, PW or EX locks are
|
|
* ignored. */
|
|
if (mode < LKM_PRMODE)
|
|
flags &= ~LKM_VALBLK;
|
|
else {
|
|
flags |= LKM_GET_LVB;
|
|
lock->lksb->flags |= DLM_LKSB_GET_LVB;
|
|
}
|
|
}
|
|
|
|
if (res->owner == dlm->node_num)
|
|
status = dlmlock_master(dlm, res, lock, flags);
|
|
else
|
|
status = dlmlock_remote(dlm, res, lock, flags);
|
|
|
|
if (status == DLM_RECOVERING || status == DLM_MIGRATING ||
|
|
status == DLM_FORWARD) {
|
|
msleep(100);
|
|
if (recovery) {
|
|
if (status != DLM_RECOVERING)
|
|
goto retry_lock;
|
|
/* wait to see the node go down, then
|
|
* drop down and allow the lockres to
|
|
* get cleaned up. need to remaster. */
|
|
dlm_wait_for_node_death(dlm, res->owner,
|
|
DLM_NODE_DEATH_WAIT_MAX);
|
|
} else {
|
|
dlm_wait_for_recovery(dlm);
|
|
goto retry_lock;
|
|
}
|
|
}
|
|
|
|
/* Inflight taken in dlm_get_lock_resource() is dropped here */
|
|
spin_lock(&res->spinlock);
|
|
dlm_lockres_drop_inflight_ref(dlm, res);
|
|
spin_unlock(&res->spinlock);
|
|
|
|
dlm_lockres_calc_usage(dlm, res);
|
|
dlm_kick_thread(dlm, res);
|
|
|
|
if (status != DLM_NORMAL) {
|
|
lock->lksb->flags &= ~DLM_LKSB_GET_LVB;
|
|
if (status != DLM_NOTQUEUED)
|
|
dlm_error(status);
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
error:
|
|
if (status != DLM_NORMAL) {
|
|
if (lock && !convert)
|
|
dlm_lock_put(lock);
|
|
// this is kind of unnecessary
|
|
lksb->status = status;
|
|
}
|
|
|
|
/* put lockres ref from the convert path
|
|
* or from dlm_get_lock_resource */
|
|
if (res)
|
|
dlm_lockres_put(res);
|
|
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dlmlock);
|