[LEDE-DEV] [RFC v2 3/3] config: ext4: increase x86 rootfs size to 2GB to support online resize2fs

[Michael Heimpold]

Am Dienstag, 25. Oktober 2016, 13:02:05 CEST schrieb Jo-Philipp Wich:
> 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 at mein.io>
> ---
>  config/Config-images.in | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/config/Config-images.in b/config/Config-images.in
> index 1a6951d..1866bb1 100644
> --- 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.

Acked-by: Michael Heimpold <mhei at heimpold.de>