lkml.org 
[lkml]   [1999]   [Nov]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Linux Buffer Cache Does Not Support Mirroring

I looked at the brw_page code. While everyone calls this an "async"
interface, in fact, it uses the same semantic as a sync interface and
does not allow support for callbacks.

Jeff

kernel@kvack.org wrote:
>
> On Mon, 1 Nov 1999, Jeff V. Merkey wrote:
>
> > What everyone is side-stepping is that the interface between the drivers
> > and the buffer cache is incestuous
>
> What do you mean by incestuous -- if you mean that they depend on it,
> you're thinking of things in the wrong way. Think of the buffer_head as a
> block io tag. The block drivers themselves don't interact with the buffer
> cache, they interact with requests.
>
> > -- this prevents folks from building
> > async I/O based FS's on Linux. The solution is not a simple one -- the
> > drivers and buffer cache interface needs to be changed to elimnate these
> > dependencies so.
>
> So you're incapable of making use of b_end_io to complete an async io
> request? Wow.
>
> -ben
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.rutgers.edu
> Please read the FAQ at http://www.tux.org/lkml/

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

\
 
 \ /
  Last update: 2005-03-22 13:54    [W:0.688 / U:2.436 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site