I have configured and built the latest kernel 2.6.22-rc4-mm2 which has reiser4 support. If you want to see the .config file then i can post it. Anyway, I installed the kernel and made the initrd fine. I got reiser4progs version 1.0.6 installed and created a filesystem with 'mkfs.reiser4 -o create=ccreg40 /dev/TheLVM' (for compression which is fairly important) atop a linearly merged 3-disk lvm logical volume. The creation went fine but now I can't mount it. Mount gives the error 'mount: unkwown filesystem type 'reiser4''. It is as if the kernel doesn't have reiser4 support even though it is compiled into the kernel. Right now it is set to be compiled in, but before when it was supposed to be a module I noticed that there was no reiser4 module. modprobe couldn't find a reiser4 module. So the question is, is there anything special to be done in fedora 7 for reiser4, or is there something special to be done in the kernel configuration?

you have to mount a compressed filesystem with something like, mount -o reiser4.1-beta along with the other parts of the mount command. And the default version of reiser4 doesn't include the cryptcompress support. You have to have reiser4 beta version 4.1. I don't know if mm2 has that version built in or not.

To quote http://groups.google.com/group/fa.li...95bc87aaeb6d7d,
So it looks rather like the 2.6.22-rc4-mm2 should have it in.
What is that option 'reiser4.1-beta' supposed to do? Also remember that i'm getting an unkwown filesystem type error from mount. Mount can't mount any reiser4 even without compression, I tried.

sorry. that beta4.1 stuff was what you had to use several months ago, the last time i tried it out. I've been using patches from: ftp://ftp.namesys.com/pub/reiser4-for-2.6/

for a while now, but i'm just using uncompressed reiser4.
I just read somewhere tonight that a recent -mm kernel had cryptcompress disabled. I can't remember where though.

There are a lot of articles on REISER4 at

http://linuxhelp.150m.com/

They were very helpful for me.

Sorry, but that was a long time ago. Since then i couldn't get it to work,then i fell in love with ZFS, it made reiser look like canned pig meat to me, I tried a internal release build of OpenSolaris Nevada, but it didn't work on my dandy Pentium3, then I went freebsd current with zfs, all went well for a while (ZFS rocks!), but then the unmirrored non-ZFS root drive catastrophically failed, and all was lost. Thankfully no bits hit the bit bucket though. I would never leave a helpless bit un backed up!

Yeah, but ZFS doesn't run on Linux (except for a slow user-space driver).

If freebsd supports zfs, then porting it to Linux would be a breeze. So why don't you do it?

Wow! What a great but unoriginal idea! Unfortunately, due to license incompatibilities with Sun's CDDL and the GPL, it can't be put in the kernel. Though there has been some effort to port zfs to fuse.

staying @ sideways...........