Slava Pestov wrote:

On Sat, Dec 27, 2014 at 2:52 AM, Stephen R. van den Berg [off-list ref] wrote:

quoted

- That the amount of memory being allocated for a single caching device
exceeds maximum the amount allocatable by get_free_pages(), so I changed

As you've already noticed this is fixed in bcache-dev, but that brings in a

I already hoped it would have been, but since the ondisk format changed,
I couldn't fully confirm this yet.  I don't mind changing the on-disk format,
BTW, because I am still able to reformat the disks before the servers
go into production.

Support for multiple cache devices is in bcache-dev, it requires changes
to both make-bcache and the kernel. I'm not sure what the time frame for
upstreaming this is, since the changes are more involved.

Well, I don't mind running a custom kernel and custom bcache userspace
tools for a while.  I have been rolling my own kernels since 1992.

I presume that eventually all changes will be upstreamed (including the
changes in the on-disk format)?  So, until then, I'll simply rebase bcache-dev
on top of the most recent kernels manually.

I *would* be interested in the new bcache userspace tools though then.
-- 
Stephen.