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How can I log my kernel module (let's call him "test") work process to read by typing cat /sys/module/test/stat/volumes? Which way should I go? Have I use something from kobject functionality or it's possible to write from kernel functions?

Can you please give examples of such work?

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In this case, you have to use kobject approach and create function (of course with all the auxiliary) like this:

static struct kobj_attribute stat_info_attribute = __ATTR(volumes, 0444, stat_info_show, stat_info_store);

After that you have to initializate it in __init function.

Full listing with realisation you can find here.

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