On Wed, 21 Feb 2007, Tzahi Fadida wrote:
Hi, Is it possible to replace a function in the kernel (using a module) without recompiling. This function is an exported function. Basically i wish to extend a functionality of a function (without asking for a stub at this point). Specifically the function void submit_bio(int rw, struct bio *bio) in /block/ll_rw_blk.c Not that i can't recompile the kernel, it is just that i want to create a module that would be able to be distributed with more convenience. The idea, of course, is to call the submit_bio using the new function but also do other stuff afterward. Basically i wish to extend the functionallity of block_dump (for fun and study purposes) to be centralized in some /proc entry with some stats.
I remember that this is described in the linux drivers books or someplace like that. Afaik it involves moving the code of the original function or something like that. It is a two step process, with a loader stub doing some work, then the actual new function is loaded and patched (?) in.
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