[OpenWrt-Devel] [PATCH] x86: fix unusable squashfs images by adding missing padding

Petr Štetiar ynezz at true.cz
Sat Apr 25 06:56:17 EDT 2020

It was reported, that after image generation rework
x86-64-generic-squashfs-rootfs.img image won't boot on XenServer x86_64

 F2FS-fs (xvda): Magic Mismatch, valid(0xf2f52010) - read(0x84289960)
 F2FS-fs (xvda): Can't find valid F2FS filesystem in 1th superblock
 F2FS-fs (xvda): Magic Mismatch, valid(0xf2f52010) - read(0x4e8ee223)
 F2FS-fs (xvda): Can't find valid F2FS filesystem in 2th superblock
 List of all partitions:
 ca00            4207 xvda
  driver: vbd
 No filesystem could mount root, tried:

 Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(202,0)

So lets fix this by adding back padding which was introduced in commit
a17d9482f5e2 ("x86: image: fix small disk space in squashfs overlay").

Ref: FS#3036
Cc: Paul Spooren <mail at aparcar.org>
Cc: Tomasz Maciej Nowak <tomek_n at o2.pl>
Fixes: 258f070d1a4f ("x86: fix missing squashfs and ext4 rootfs images")
Fixes: cb007a7bf619 ("x86: switch image generation to new code")
Signed-off-by: Petr Štetiar <ynezz at true.cz>
 target/linux/x86/image/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/target/linux/x86/image/Makefile b/target/linux/x86/image/Makefile
index 72a4d66ad731..174c272a515e 100644
--- a/target/linux/x86/image/Makefile
+++ b/target/linux/x86/image/Makefile
@@ -111,8 +111,8 @@ define Device/Default
   IMAGE/combined.img.gz := grub-config pc | combined | grub-install | gzip | append-metadata
   IMAGE/combined.vdi := grub-config pc | combined | grub-install | qemu-image vdi
   IMAGE/combined.vmdk := grub-config pc | combined | grub-install | qemu-image vmdk
-  IMAGE/rootfs.img := append-rootfs
-  IMAGE/rootfs.img.gz := append-rootfs | gzip
+  IMAGE/rootfs.img := append-rootfs | pad-to $(ROOTFS_PARTSIZE)
+  IMAGE/rootfs.img.gz := append-rootfs | pad-to $(ROOTFS_PARTSIZE) | gzip
   ARTIFACT/image-efi.iso := grub-config iso | iso efi
   IMAGE/combined-efi.img := grub-config efi | combined efi | grub-install efi | append-metadata
   IMAGE/combined-efi.img.gz := grub-config efi | combined efi | grub-install efi | gzip | append-metadata

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