I'm probably not the only one who would like to run a
distribution-provided kernel (which for Debian Wheezy/Ubuntu Precise is
3.2) and still have a recent-enough Ceph kernel client. So I'm wondering
whether it's feasible to backport the kernel client to an earlier kernel.
The plan is as follows:
1) Grab the Ceph files from https://github.com/ceph/ceph-client (and put
them over the older kernel sources). If I got it right the files are:
include/keys/ceph-type.h include/linux/ceph/* fs/ceph/* net/ceph/*
drivers/block/rbd.c drivers/block/rbd_types.h
2) Make (trivial) adjustments to the source code to account for changed
kernel interfaces.
3) Compile as modules and install the new Ceph modules under /lib/modules.
4) Reboot to a standard distribution kernel with up-to-date Ceph client.
Now the main questions are:
Q1: Is the Ceph client contained in the files mentioned in 1), or does it
include changes elsewhere in the kernel that cannot be built as modules?
Q2: Regarding 2), are there any nontrivial interface changes i.e. Ceph
actually using newly introduced features instead of just adapting to
a changed syntax?
Any other thoughts or comments on this?
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