Re: bcache with existing ext4 filesystem

On Tue, Jul 25, 2017 at 01:12:10PM +0200, Pavel Machek wrote:

Well... if I move the partition, grub2 (etc) will be unable to access
data on it. (Plus I do not have free space before some of the
partitions I'd like to be cached).

Both Grub and Linux's implementation of ext4 expect the superblock to
be at offset 1024 bytes from the beginning of the block device.

From looking at Documentation/bcache.txt, the problem is that bcache
works much like LVM or device mapper.  That is, you have to create the
file system on /dev/bcacheN.  That simplies that grub needs to
understand bcache, which as far as I understand, it doesn't today.

      	     	  	      	 	 - Ted