btrfs: create an empty file to build the fs in

The newer btrfs-utils needs an empty file to build the filesystem in, so
create an empty file and use it for the mkfs to build the fs in.

[YOCTO #6804]

(From OE-Core rev: 224c24d8a8ea6230ed56ea61cdb86e78c5ec4311)

Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/meta/classes/image_types.bbclass b/meta/classes/image_types.bbclass
index 0c27f298fc..d6cc87f79d 100644
--- a/meta/classes/image_types.bbclass
+++ b/meta/classes/image_types.bbclass
@@ -59,8 +59,8 @@ IMAGE_CMD_ext3 = "oe_mkext234fs ext3 ${EXTRA_IMAGECMD}"
 IMAGE_CMD_ext4 = "oe_mkext234fs ext4 ${EXTRA_IMAGECMD}"
 
 IMAGE_CMD_btrfs () {
-        touch ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.btrfs
-        mkfs.btrfs -b `expr ${ROOTFS_SIZE} \* 1024` ${EXTRA_IMAGECMD} -r ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.btrfs
+        dd if=/dev/zero of=${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.btrfs count=${ROOTFS_SIZE} bs=1024
+        mkfs.btrfs ${EXTRA_IMAGECMD} -r ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.btrfs
 }
 
 IMAGE_CMD_squashfs = "mksquashfs ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.squashfs ${EXTRA_IMAGECMD} -noappend"