there are somewhat ugly, but might be useful to someone.
-------
we now need to modify the kernel, build a userspace daemon and modified
mount (that understand the fscache option) in order to the the
NFS/FS-Cache combo working
everything one needs is at
http://people.redhat.com/~steved/fscache/
1) http://people.redhat.com/~steved/fscache/cachefilesd/ <- contains
userspace setup tool/daemon
it's available as a source rpm, I just used
rpm2cpio sourcerpm |cpio -i
to extract it and then built it.
However, it wasn't "easy"
one needs to run automake and autoconf, but automake will complain about
files missing, they are readily available on the system in the automake
dir so just copy them into place ("locate" them)
the main thing that was a problem is that it needs glibc 2.4,
unfortunately debian still is using 2.3, however 2.4 is available in
"experimental" as 2.3.999 and that works fine.
so make ; make install
however, it won't work yet as need a patched kernel
2) http://people.redhat.com/~steved/fscache/patches/ <- contains all the
kernel patches
apply all of them. Unfortunately they aren't listed in appropriate
order via the web, so might have come "failures"
was easy enough to fix by looking at the rejected files.
then I did a "make oldconfig" on the kernel source code and enables the
fs cache and enable nfs to use it, but didn't bother with afs.
I took the resulting bzImage and replaced the linux file in the tftpboot
area with it and rebooted, and it worked.
we then need a "backing store" area this is a regular file system, ext2
doesn't work but ext3 does.
so mkfs.ext3 some device. it also needs xattr support so tune2fs -o
user_xattr some device to enable it
then mount it on /var/fscache (within the pxe booted system)
we can now make sure /etc/cachefilesd.conf exists with a single line of
"dir /var/fscache"
we can now run "cachefilesd -s" (for some reason don't get good output
without -s) and if it says "Bound cache" everything is fine.
3) we need to modify util-linux to support the "fsc" option (so nfs will
use the fs cache)
the patches and full source and redhat binaries are located at
http://people.redhat.com/~steved/fscache/util-linux/
however, the patch doesn't apply to any pure util-linux source,
therefore one extract the full source (same method as above) in its own
dir. this results in a lot of files, mostly patches though.
one can read the .spec file to see the order of extraction and what
order to apply the patch files (order is very important)
once the patch files are applied, one can then build it (./configure
--prefix=/ ; make ; make install)
and now one can mount with the fs cache backing store
mount -t nfs -o fsc nfsserver:/share /mntpoint
and hoepfully everything should "work".
