Help with writing a new "fuser"

["Greg Nate" <Greg_Nate@adp.com>]

Hello all, I hope this is the proper group. Here's where I need
direction.

I want to write a new "fuser", which makes direct kernel table calls, rather
than what the current "fuser" does, which seems to be a file-tree-walk on
/proc. We've found that on a heavily loaded system, the current "fuser" is
far too slow and can actually have a serious performance impact.

Here's my ideas sofar.

Loop through the kernel task list, and for each task, lookup its file
information. For each file structure, do a string compare with the desired
file name. If a match, then print to stdout, the PID.

While I have coded in C, I have extremely limited experience with the Linux
kernel and I have no idea where to start. If pointed in a general
direction, I should be able to ask more informed questions. At this point,
I don't know what libraries to include, what kernel structures to access or
how to access them.

Thanks much,

greg


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