mkfs.btrfs doesn't work inside loopback mounted chroot jails: error checking /dev/sda3 mount status

["Bernhard Rosenkraenzer" <bero@xxxxxxxxxxx>]

Hi,
mkfs.btrfs aborts unconditionally with "error checking [whatever] mount status" under some circumstances.

I'm running into it when using a live CD that boots from a minimal CD image, then does

mount -o loop -t squashfs /squashfs.img /mnt/realsystem
chroot /mnt/realsystem
[stuff you actually want to do here]

strace shows mkfs.btrfs aborting after trying to

lstat("/squashfs.img", 0x7fff2c712c90) = -1 ENOENT (No such file or directory)

[obviously, it can't access /squashfs.img after chroot]


I'm attaching a "fix" that allows circumventing the problem with a --force switch, patch is relative to "next" branch in git.
I'm also adding this patch to the Ark Linux package of btrfs-progs unless someone screams very loudly. ;)

ttyl
bero

Attachment: 0001-Add-a-force-option.patch
Description: Binary data