Get file data buffer from Vnode BSD OSx

Question

I'd like to to extract the file buffer data from a Vnode object.

I'm using BSD for MAC, and the link to the Vnode documention can be found here: https://opensource.apple.com/source/xnu/xnu-1456.1.26/bsd/sys/vnode.h

Also, creating a read operation for each received callback as described here: https://stackoverflow.com/a/36217596/2452682 is not an option due to kernel memory limitations.

Answer 1

What do you mean 'extract file buffer data' and what limitations do you have in mind?

In general, the use of a dedicated fs-specific read routine is unavoidable - the file content possibly is not even present in ram in the first place.

So, what are you doing?