Hi,
I'd like to report some other nice progress as well, related to other
Linux packages. Although I'm working on Fedora packaging, there is good
spin-off for all Linux distro's out there!
Util-Linux
=====
Util-Linux 2.24 will have support for bcache built in (for blkid and
wipefs): https://bugzilla.redhat.com/show_bug.cgi?id=1001120. This means
that "stuff gets more straightforward", e.g. the udev rules for bcache
can simply rely on bcache instead of also having to call probe-bcache.
There's also benefits for Dracut, see below.
Dracut
====
Dracut 032 already had bcache support, dracut 033 now has support built
in for the migration phase from probe-bcache to blkid. I did some
testing with a root FS on bcache, and dracut perfectly builds a booting
initramfs! Beware though that there is a (soft) dependency on Util-Linux
2.24. When using an older Util-linux users should pass the -N option to
dracut te build a functional initramfs. More details:
https://bugzilla.redhat.com/show_bug.cgi?id=1003207
I'm aware that other distro's don't use dracut to build an initramfs,
but the dracut related info may be useful."
LVM2
===
LVM2 needs a small change to be able to detect PV's on bcache devices.
Without the change users need to add a "types = [ "bcache", 1 ]" line in
the /etc/lvm/lvm.conf. Users may also need to pass the --lvmconf option
to dracut when booting from a root FS on bcache. More details:
https://bugzilla.redhat.com/show_bug.cgi?id=1000817
In the bugzilla there's a claim that bcache support in Fedora isn't
supportable because upstream (bcache) is'nt actively working with
Fedora. I don't agree with this, because I think the collaboration with
upstream is working fine.
I'll keep you all posted,
Rolf
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