From a9e9acaeb0a981a6dfa54b32dd756103aeefa6a7 Mon Sep 17 00:00:00 2001
From: Xue jiufei <xuejiufei@huawei.com>
Date: Wed, 4 Jun 2014 16:06:13 -0700
Subject: ocfs2: fix umount hang while shutting down truncate log

Revert commit 75f82eaa502c ("ocfs2: fix NULL pointer dereference when
dismount and ocfs2rec simultaneously") because it may cause a umount
hang while shutting down the truncate log.

fix NULL pointer dereference when dismount and ocfs2rec simultaneously

The situation is as followes:
ocfs2_dismout_volume
-> ocfs2_recovery_exit
  -> free osb->recovery_map
-> ocfs2_truncate_shutdown
  -> lock global bitmap inode
    -> ocfs2_wait_for_recovery
	  -> check whether osb->recovery_map->rm_used is zero

Because osb->recovery_map is already freed, rm_used can be any other
values, so it may yield umount hang.

To prevent NULL pointer dereference while getting sys_root_inode, we use
a osb_tl_disable flag to disable schedule osb_truncate_log_wq after
truncate log shutdown.

Signed-off-by: joyce.xue <xuejiufei@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index b4deb5f..9d8fcf2 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -6046,7 +6046,8 @@ static void ocfs2_truncate_log_worker(struct work_struct *work)
 void ocfs2_schedule_truncate_log_flush(struct ocfs2_super *osb,
 				       int cancel)
 {
-	if (osb->osb_tl_inode) {
+	if (osb->osb_tl_inode &&
+			atomic_read(&osb->osb_tl_disable) == 0) {
 		/* We want to push off log flushes while truncates are
 		 * still running. */
 		if (cancel)
@@ -6223,6 +6224,8 @@ void ocfs2_truncate_log_shutdown(struct ocfs2_super *osb)
 	int status;
 	struct inode *tl_inode = osb->osb_tl_inode;
 
+	atomic_set(&osb->osb_tl_disable, 1);
+
 	if (tl_inode) {
 		cancel_delayed_work(&osb->osb_truncate_log_wq);
 		flush_workqueue(ocfs2_wq);
@@ -6254,6 +6257,7 @@ int ocfs2_truncate_log_init(struct ocfs2_super *osb)
 	 * until we're sure all is well. */
 	INIT_DELAYED_WORK(&osb->osb_truncate_log_wq,
 			  ocfs2_truncate_log_worker);
+	atomic_set(&osb->osb_tl_disable, 0);
 	osb->osb_tl_bh    = tl_bh;
 	osb->osb_tl_inode = tl_inode;
 
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 8d64a97..bbec539 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -422,6 +422,7 @@ struct ocfs2_super
 	struct inode			*osb_tl_inode;
 	struct buffer_head		*osb_tl_bh;
 	struct delayed_work		osb_truncate_log_wq;
+	atomic_t			osb_tl_disable;
 	/*
 	 * How many clusters in our truncate log.
 	 * It must be protected by osb_tl_inode->i_mutex.
-- 
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