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Melab
Asked: 2015-08-29 09:11:57 +0800 CST

Loop module not present on Ubuntu installation

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sudo modprobe loop max_loop=255 does not return an error, but lsmod | grep "loop" returns nothing. Likewise find /lib/modules/$(uname -r) -name "loop.ko" doesn't print any paths to the screen.

I'd think that this was because it was missing, but if I use modprobe to load a nonsense name, then I get an error that it doesn't exist.

So, where is the kernel module loop? Does it exist at all?

kernel

2 Answers

  1. loop must be compiled into the kernel and not built as a ko module.

    That is why it does not appear in lsmod.

    You can change max_loop as a boot parameter.

    The parameter is called max_loop=255. You can set it in /etc/default/grub in line GRUB_CMDLINE_LINUX_DEFAULT.

    Then run sudo update-grub.

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  2. It's likely compiled into the kernel, rather than being available as a separate loadable module: for example, on my 14.04 system

    ~$ grep 'loop' /lib/modules/`uname -r`/modules.builtin
kernel/drivers/block/loop.ko

    See this StackOverflow discussion: Linux Loadable modules and built-in modules.

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