[oe-commits] Alex Franco : Empty image: filesystem allocation

[git at git.openembedded.org]

Module: openembedded-core.git
Branch: master-next
Commit: 6938791ff97a23430afb4aa16d71aa8729a12ead
URL:    http://git.openembedded.org/?p=openembedded-core.git&a=commit;h=6938791ff97a23430afb4aa16d71aa8729a12ead

Author: Alex Franco <alejandro.franco at linux.intel.com>
Date:   Wed Aug 26 16:57:35 2015 -0500

Empty image: filesystem allocation

Increase sparse image block size when ROOTFS_SIZE is smaller than
the minimum needed for ext4 to fit into it.

[YOCTO #7664]

Signed-off-by: Alex Franco <alejandro.franco at linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>

---

 meta/classes/image_types.bbclass | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/meta/classes/image_types.bbclass b/meta/classes/image_types.bbclass
index 8547574..2fd4c37 100644
--- a/meta/classes/image_types.bbclass
+++ b/meta/classes/image_types.bbclass
@@ -49,8 +49,16 @@ oe_mkext234fs () {
 		extra_imagecmd=$@
 	fi
 
+	# If generating an empty image the size of the sparse block should be large
+	# enough to allocate an ext4 filesystem using 4096 bytes per inode, this is
+	# about 60K, so dd needs a minimum count of 60, with bs=1024 (bytes per IO)
+	eval local COUNT=\"0\"
+	eval local MIN_COUNT=\"60\"
+	if [ $ROOTFS_SIZE -lt $MIN_COUNT ]; then
+		eval COUNT=\"$MIN_COUNT\"
+	fi
 	# Create a sparse image block
-	dd if=/dev/zero of=${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.$fstype seek=$ROOTFS_SIZE count=0 bs=1k
+	dd if=/dev/zero of=${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.$fstype seek=$ROOTFS_SIZE count=$COUNT bs=1024
 	mkfs.$fstype -F $extra_imagecmd ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.$fstype -d ${IMAGE_ROOTFS}
 }