On Mon, Mar 27, 2006 at 07:57:50AM -0800, Chuck Silvers wrote:
> hi folks,
> 
> I've finished the initial implementation of direct I/O,
> there's an updated diff in:
> 
> ftp://ftp.netbsd.org/pub/NetBSD/misc/chs/dio/diff.directio.3
> 
> this version does not allow concurrent writes to files, it's only
> intended to provide the ability to prevent caching fs data in the
> kernel.  I'll add support for concurrency of non-overlapping writes
> in a separate change.
> 
> if no one sees any problems with this part of the work,
> I'll check it in (along with associated doc changes) later this week.
> 
> -Chuck

From genfs_directio():

    /*
     * We only support direct I/O to user space for now.
     */

Any chance to remove this restriction? fss(4) and vnd(4) would be
candidates to use it from kernel space.

-- 
Juergen Hannken-Illjes - hannken@eis.cs.tu-bs.de - TU Braunschweig (Germany)