From 6ff06a93916b3f95e83c346f7530cf2f5c68ae0c Mon Sep 17 00:00:00 2001
From: Kurt Hackel <kurt.hackel@oracle.com>
Date: Mon, 1 May 2006 11:51:45 -0700
Subject: [PATCH] ocfs2: give the dlm dirty list a reference on the lockres
Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
---
fs/ocfs2/dlm/dlmcommon.h | 14 +++++++++++---
fs/ocfs2/dlm/dlmthread.c | 6 ++++++
2 files changed, 17 insertions(+), 3 deletions(-)
diff --git a/fs/ocfs2/dlm/dlmcommon.h b/fs/ocfs2/dlm/dlmcommon.h
index 78eccd0951e4..829cc3948804 100644
--- a/fs/ocfs2/dlm/dlmcommon.h
+++ b/fs/ocfs2/dlm/dlmcommon.h
@@ -235,18 +235,26 @@ struct dlm_lock_resource
struct qstr lockname;
struct kref refs;
- /* please keep these next 3 in this order
- * some funcs want to iterate over all lists */
+ /*
+ * Please keep granted, converting, and blocked in this order,
+ * as some funcs want to iterate over all lists.
+ *
+ * All four lists are protected by the hash's reference.
+ */
struct list_head granted;
struct list_head converting;
struct list_head blocked;
+ struct list_head purge;
+ /*
+ * These two lists require you to hold an additional reference
+ * while they are on the list.
+ */
struct list_head dirty;
struct list_head recovering; // dlm_recovery_ctxt.resources list
/* unused lock resources have their last_used stamped and are
* put on a list for the dlm thread to run. */
- struct list_head purge;
unsigned long last_used;
unsigned migration_pending:1;
diff --git a/fs/ocfs2/dlm/dlmthread.c b/fs/ocfs2/dlm/dlmthread.c
index 76526ea95bb2..610dc76a851b 100644
--- a/fs/ocfs2/dlm/dlmthread.c
+++ b/fs/ocfs2/dlm/dlmthread.c
@@ -455,6 +455,8 @@ void __dlm_dirty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res)
/* don't shuffle secondary queues */
if ((res->owner == dlm->node_num) &&
!(res->state & DLM_LOCK_RES_DIRTY)) {
+ /* ref for dirty_list */
+ dlm_lockres_get(res);
list_add_tail(&res->dirty, &dlm->dirty_list);
res->state |= DLM_LOCK_RES_DIRTY;
}
@@ -639,6 +641,8 @@ static int dlm_thread(void *data)
list_del_init(&res->dirty);
spin_unlock(&res->spinlock);
spin_unlock(&dlm->spinlock);
+ /* Drop dirty_list ref */
+ dlm_lockres_put(res);
/* lockres can be re-dirtied/re-added to the
* dirty_list in this gap, but that is ok */
@@ -691,6 +695,8 @@ in_progress:
/* if the lock was in-progress, stick
* it on the back of the list */
if (delay) {
+ /* ref for dirty_list */
+ dlm_lockres_get(res);
spin_lock(&res->spinlock);
list_add_tail(&res->dirty, &dlm->dirty_list);
res->state |= DLM_LOCK_RES_DIRTY;
--
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