Subject: Re: New read & write syscalls
To: Bill Studenmund <>
From: Eduardo E. Horvath <>
List: tech-kern
Date: 07/01/1999 09:01:24
> 1) Add the idea of "alternate" read semantics. For our work, that's ignore
> the residency checks. For a compressing layer, it'd be access the
> compressed data rather than the uncompressed. As the difference is in a
> bit set in the ioflags passed to the READ/WRITE VOP's, fs's which don't
> have this concept ignore it.
> An fs could, at its discression, restrict these semantics to the super
> user as it saw fit.

Is there some reason you couldn't do this by simply bypassing the upper
layer filesystem that implements the "standard" semantics and operating
directly on the data in the lower filesystem?

Eduardo Horvath
	"I need to find a pithy new quote." -- me