From 1b08a68a4f3656bd2e0ab526418c5d97e547a5c7 Mon Sep 17 00:00:00 2001
From: Ingo Weinhold <ingo_weinhold@gmx.de>
Date: Tue, 21 Jun 2011 23:26:23 +0200
Subject: [PATCH] vfs_bind_mount_directory(): Fail if unmounting

---
 src/system/kernel/fs/vfs.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/system/kernel/fs/vfs.cpp b/src/system/kernel/fs/vfs.cpp
index 8162aebbbe..e4f84f247f 100644
--- a/src/system/kernel/fs/vfs.cpp
+++ b/src/system/kernel/fs/vfs.cpp
@@ -5019,8 +5019,10 @@ vfs_bind_mount_directory(dev_t mountID, ino_t nodeID, dev_t coveredMountID,
 	// establish the covered/covering links
 	WriteLocker locker(sVnodeLock);
 
-	if (vnode->covers != NULL || coveredVnode->covered_by != NULL)
+	if (vnode->covers != NULL || coveredVnode->covered_by != NULL
+		|| vnode->mount->unmounting || coveredVnode->mount->unmounting) {
 		return B_BUSY;
+	}
 
 	vnode->covers = coveredVnode;
 	vnode->SetCovering(true);