config: ext4: increase x86 rootfs size to 2GB to support online resize2fs

The current default rootfs size of 256MB in conjunction with 4K blocks
produces an ext4 filesystem which lacks the appropriate amount of backup GDT
entries to support online-resizing.

For x86 targets, increase the default rootfs size to 2048MB which allows
online resizing the filesystem to up to 2TB which is the current theoretical
maximum for LEDE, due to missing GPT support on the root block device.

Note that the filesystem artefact will not occupy 2GB on the build system as
the make_ext4fs utility uses sparse files to generate the filesystem images,
so the actual disk usage is much lower. Furthermore the filesystem images
are gzip compressed, shrinking them to only a few megabytes on the download
server.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Acked-by: Michael Heimpold <mhei@heimpold.de>

diff --git a/config/Config-images.in b/config/Config-images.in
index 1a6951dfb781499bbe1c00ab5ae500e04d576973..1866bb13254014ca1906461bc8d93fc9c01880b3 100644 (file)
--- a/config/Config-images.in
+++ b/config/Config-images.in
@@ -253,7 +253,8 @@ menu "Target Images"
        config TARGET_ROOTFS_PARTSIZE
                int "Root filesystem partition size (in MB)"
                depends on GRUB_IMAGES || TARGET_ROOTFS_EXT4FS || TARGET_rb532 || TARGET_mvebu
-               default 256
+               default 2048 if TARGET_x86
+               default 256 if ! TARGET_x86
                help
                  Select the root filesystem partition size.