lkml.org 
[lkml]   [2000]   [Oct]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: mapping user space buffer to kernel address space
Hi,

On Fri, Oct 13, 2000 at 12:30:49PM +0100, Malcolm Beattie wrote:

> free_kiovec(1, &iobuf); /* does an implicit unlock_kiovec */
>
> It doesn't do an unmap_kiobuf(iobuf) so I don't understand where
> the per-page map->count that map_user_kiobuf incremented gets
> decremented again. Anyone?

The 2.4 raw code I'm looking at does an explicit unmap_kiobuf after
each brw_kiovec().

> Lowlevel I/O on a kiovec can be done
> with something like an ll_rw_kiovec which sct said was going to get
> put in but since I haven't read anything more recent than
> 2.4.0-test5 at the moment, I can't say if it's there or what it
> looks like.

It's being maintained inside the SGI XFS tree right now. They've got
it pretty stable under XFS load so I'll probably put together the
ll_rw_kio functionality using their low level code the next time I do
a kiovec release. I believe that the XFS tree has 2.4.0-test9 support
for this code.

Cheers,
Stephen
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:45    [W:0.090 / U:3.340 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site