I have been wondering: If I recall correctly: the backing device is just a bunch of bytes right ? (Excluding the bcache header.) If the bcachefs header (for the backing device) isn't bigger then bcache, one should be able to write a tool to wipe the bcache header. Could one copy the dev.data.first_sector from the bcache-header and write a new bcachefs-header using this information ? So the steps could be: 1) Remove the caching device. 2) Unmount it (could be tricky in some situation, like the root mount) 3) Run make-bcachefs --upgrade /dev/xxx 4) Add your caching device. -- Killian De Volder -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
