Merging multiple erofs file systems on the same block device

[Daan De Meyer]

Hi,

I've been looking into erofs as an initramfs replacement by using
root=/dev/ram0 to tell the kernel to load the initramfs as a ramdisk.
However, by using a ramdisk instead of the usual compressed cpio, I
would lose the feature where the kernel merges multiple individual
cpios together into a single tmpfs filesystem. Looking at the
documentation for erofs, I noticed that erofs already seems to support
merging multiple erofs filesystems on separate block devices using the
device= cmdline option. Would it be possible to extend this so that
multiple erofs filesystems that follow each other on the same block
device can also be merged? This would allow me to pass multiple erofs
filesystems to the kernel via initrd=, which would get concatenated
together into a single buffer, which the kernel would write to a
ramdisk (using root=/dev/ram0) which the kernel would then have erofs
mount to /dev/root. erofs would notice that there's multiple erofs
filesystems on the ramdisk and overlay them together (perhaps only if
a cmdline option is enabled).

Does this make sense at all?

Cheers,

Daan De Meyer