[bug #41449] It doesn't recognize btrfs default subvolume.

[Massimiliano Torromeo]

Follow-up Comment #2, bug #41449 (project grub):

Even though it is not grub-mkrelpath's fault that the default subvolume is
ignored, the resulting grub-conf includes the subvolume path as the root
prefix of the kernel path and this is wrong.

Example:

btrfs default submodule: /__active

wrong: linux   /__active/boot/vmlinuz-linux root=UUID=... rw
rootflags=subvol=__active

correct: linux   /boot/vmlinuz-linux root=UUID=... rw
rootflags=subvol=__active

The rootflags may be superfluous but the linux path should be fixed or it
won't boot. The result is grub searching for the kernel in the effetive path:
/__active/__active/boot/vmlinuz-linux



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