image_types: btrfs use sparse file creation

PATCH New Saul Wold 1 participant 1 message Dec 7, 2017

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Saul Wold

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2017-12-07 03:37 UTC #0 lore raw

PATCH 1/1 image_types: btrfs use sparse file creation

This will speed up file creation and still allow the btrfs tools to create a full btrfs image. This is similar to what we do for ext234 FS types.

Signed-off-by Saul Wold <[email protected]>

---
 meta/classes/image_types.bbclass | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

meta/classes/image_types.bbclass +1 -1

index aaba1073a08..ce7699d9b60 100644
@@ -104,7 +104,7 @@ IMAGE_CMD_btrfs () {
 		size=${MIN_BTRFS_SIZE}
 		bbwarn "Rootfs size is too small for BTRFS. Filesystem will be extended to ${size}K"
 	fi
-	dd if=/dev/zero of=${IMGDEPLOYDIR}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.btrfs count=${size} bs=1024
+	dd if=/dev/zero of=${IMGDEPLOYDIR}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.btrfs seek=${size} count=0 bs=1024
 	mkfs.btrfs ${EXTRA_IMAGECMD} -r ${IMAGE_ROOTFS} ${IMGDEPLOYDIR}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.btrfs
 }

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