System call modification

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http://stackoverflow.com – I'm doing two system calls (linux 3.2). I've created these two system calls, and I have compiled the kernel. These two system calls need to write and read on a file. I'll modify two system calls, read and write to read this file. So this file need to be accessible for these four system calls (read, write and my two system calls). My question is, where and how I can create this file and how do I access it and modify it. I will use this file only for these system calls. (HowTos)