I'm starting to hack on VFS, my first kernel hacking project, and have a couple of preliminary questions. First, I'm trying to modify 'sys_open' from fs/open.c, representing the 'open' system call. I'd like to make an update to a global data structure on every open system call. Updates to this data structure will need to be mutually exclusive in order to avoid data structure corruption. Do I need to initiate some form of concurrency control, or does 'sys_open' already happen atomically? Secondly, I'm not exactly sure where to declare and initialize the global data structure I'm referring to in the above paragraph. I expect it should be initialized when VFS is initialized. Where should I look for VFS init? I'm noticing that the buffer cache is initialized in 'buffer_init' from fs/buffer.c, but am looking for a general place to initialize my global data structure. Thanks, -- Benjamin -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
