loopfs

[Nobody's Hero]

I get the following message when running mondoarchive:

Fatal error. Can't loopmount /ASU/tmp.mondo.10647/mindilinux/5582/mountpoint.5582; does your kernel support loopfs? If not, please recompile
your kernel. Your Linux distro is broken.

I ran xconfig, and loooked under filesystem, but I dont see a loopfs kernel parm to pull in. Any ideas how I can fold in loopfs?

10x
RPM

[Claudio Cilloni]

I think it would mean loop devices. loop devices are used to see a file like a physical device. Your kernel supports loop devices if you have /dev/loop* block devices.

$ man losetup

this could help.

Ciao
Claudio

[Robert Binkhorst · Accepted solution]

Hi,

Look under "Block Devices" and select "Loopback device support".

HTH,

Robert

[Mark Grant]

Yep, you need to make sure you have the loopback device compiled in your kernel.

You'll find it under "block devices", not filesyste,

[Ralph Grothe]

If you only run make config|menuconfig|xconfig you may be fooled by the settings read from the .config file in your kernel sources dir.
To make sure just try to load the loop module.
If it works your kernel is already built for loopfs support, otherwise you will have to compile a new kernel where you configure the settings for loopfs support as told by the others.

Try something like this

[root@chaos store]# modprobe -d loop
=============================================
Module loop
kname loop
objkey loop
names: loop
mode: NORMAL
Module matching loop: /lib/modules/2.4.18-3/kernel/drivers/block/loop.o
=============================================
[root@chaos store]# lsmod|grep loop
loop 11024 0 (unused)


Or if you have an ISO image laying around try to mount it with the "-loop" switch of mount.

[root@chaos root]# mount -o loop /opt/store/hostap.iso /mnt/tmp1
[root@chaos root]# df -k /mnt/tmp1
Filesystem 1k-blocks Used Available Use% Mounted on
/opt/store/hostap.iso
79488 79488 0 100% /mnt/tmp1
[root@chaos root]# lsmod|grep loop
loop 11024 3

[Martin P.J. Zinser]

You also might want to check the .config of your kernel. Mine looks like this

grep -i loop .config
CONFIG_BLK_DEV_LOOP=y

Which means the loop support is actually build into the Kernel directly in this case.

CONFIG_BLK_DEV_LOOP=m would indicate module support and =n no support.

Greetings, Martin