> -----Original Message-----
> From: centos-bounces@xxxxxxxxxx
> [mailto:centos-bounces@xxxxxxxxxx] On Behalf Of John R Pierce
> Sent: Tuesday, August 26, 2014 20:11
> To: centos@xxxxxxxxxx
> Subject: Re: Copy on write loop block driver
>
> On 8/26/2014 5:03 PM, Jason Pyeron wrote:
> > What am I doing wrong here?
>
> A) you don't create anything in /dev, the driver should be
> using devfs
> to create its own devnodes on the fly as needed.
I assumed such, but it did not work.
>
> B) you apparently never loaded the driver. see
> http://www.atcomputing.nl/Tools/cowloop/loadunload.html
>
3.2.0.1 says:
root@localhost ~/cowloop-3.2.0.1
# cat RELEASENOTES.3.2.0
This is version 3.2 of the Copy on Write loop driver 'cowloop'
by ATComputing in Nijmegen, The Netherlands.
Release date: September 2009.
----
Cowloop wil be part of the 2.6.31 kernel. This has lead to some
changes in the cowloop utils. Obviously the kernel module has
been removed from the distribution, only the utilities remain.
root@localhost ~/cowloop-3.2.0.1
# modprobe cowloop
FATAL: Module cowloop not found.
root@localhost ~/cowloop-3.2.0.1
# find | grep loop
./man/man4/cowloop.4
./doc/cowloop.ps.bz2
./doc/README.cowloop.doc
./src/cowloop.h
So there is no loop driver compiled from this source, but the docs say it is supposed to be included in
root@localhost ~/cowloop-3.2.0.1
# yum whatprovides *cowloop*
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
No Matches found
root@localhost ~
# rpm -iv kernel-2.6.32-431.el6.src.rpm
It looks like the kernel does not have it set
root@localhost ~/rpmbuild/BUILD
# grep -ri cowloop kernel-2.6.32-431.el6/
kernel-2.6.32-431.el6/linux-2.6.32-431.el6.x86_64/temp-i686-debug-final:# CONFIG_COWLOOP is not set
kernel-2.6.32-431.el6/linux-2.6.32-431.el6.x86_64/.config.old:# CONFIG_COWLOOP is not set
kernel-2.6.32-431.el6/linux-2.6.32-431.el6.x86_64/temp-i686-final:# CONFIG_COWLOOP is not set
kernel-2.6.32-431.el6/linux-2.6.32-431.el6.x86_64/config-generic:# CONFIG_COWLOOP is not set
I cannot make this a module:
root@localhost ~/rpmbuild/BUILD/kernel-2.6.32-431.el6/linux-2.6.32-431.el6.x86_64
# make
HOSTLD scripts/kconfig/conf
scripts/kconfig/conf -s arch/x86/Kconfig
.config:1304:warning: symbol value 'm' invalid for BLK_DEV_COW_COMMON
#
# configuration written to .config
#
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