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    PaulHowarth/Blog/2008-11-15

Saturday 15th November 2008

Kernel loop module now built-in in Fedora 9

Rebooted my build server into the new 2.6.27.5-37.fc9.x86_64 kernel and found that a bunch of loopback-mounted ISO images didn't get mounted, due to running out of loop devices. This is a problem I'd fixed a long time ago by creating a file /etc/modprobe.d/loop containing this line: 

options loop max_loop=64

Running lsmod revealed that the loop module wasn't even loaded. It turned out that this kernel update has a new configuration in which the loop module is built-in to the kernel rather than being a module: 

$ fgrep LOOP /boot/config-2.6.2*
/boot/config-2.6.26.5-45.fc9.x86_64:CONFIG_BLK_DEV_LOOP=m
/boot/config-2.6.26.5-45.fc9.x86_64:CONFIG_BLK_DEV_CRYPTOLOOP=m
/boot/config-2.6.26.6-79.fc9.x86_64:CONFIG_BLK_DEV_LOOP=m
/boot/config-2.6.26.6-79.fc9.x86_64:CONFIG_BLK_DEV_CRYPTOLOOP=m
/boot/config-2.6.27.5-37.fc9.x86_64:CONFIG_BLK_DEV_LOOP=y
/boot/config-2.6.27.5-37.fc9.x86_64:CONFIG_BLK_DEV_CRYPTOLOOP=m

I don't know if this is going to a long-term change or not since I didn't see anything in the changelog about it, but the fix for now is to add the appropriate option in /boot/grub/grub.conf: 

title Fedora (2.6.27.5-37.fc9.x86_64)
        root (hd0,1)
        kernel /vmlinuz-2.6.27.5-37.fc9.x86_64 ro root=/dev/VgOS/lvroot max_loop=64
        initrd /initrd-2.6.27.5-37.fc9.x86_64.img

Local Packages

  • Final one of the perl module package cleanups: perl-Test-Manifest

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