On Wed, 2003-09-17 at 11:24, Alan Stern wrote:

quoted

However, all that seems rather roundabout.  An equally acceptable solution 
would be simply to invalidate all the entries in the page cache referring 
to my file, so that reads would be forced to go to the drive.  Can anyone 
tell me how to do that?

On Wed, Sep 17, 2003 at 12:44:29PM -0700, Dave Hansen wrote:

Whatever you're trying to do, you probably shouldn't be doing it in the
kernel to begin with.  Do it from userspace, it will save you a lot of
pain.

If you really want to bypass the pagecache etc. entirely, use raw io and
don't even bother mounting the filesystem, and do it all from userspace.
If you need it simultaneously mounted then you're in somewhat deeper
trouble, though you can probably be rescued by nefarious means like that
bit about shooting down the pagecache so you don't have some incoherent
cache headache.


-- wli
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