lkml.org 
[lkml]   [2001]   [May]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Getting FS access events


On Tue, 15 May 2001, Daniel Phillips wrote:

> That's because you left out his invalidate:
>
> * create an instance in pagecache
> * start reading into buffer cache (doesn't invalidate, right?)
> * start writing using pagecache (invalidate buffer copy)

Bzzert. You have a race here. Let's make it explicit:

start writing
put write request in queue
block on that
start reading into buffer cache
put read request into queue
read from media
write to media

And no, we can't invalidate from IO completion hook.

> * lose the page
> * try to read it (via pagecache)
>
> Everthing ok.

Nope.

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

\
 
 \ /
  Last update: 2005-03-22 12:53    [W:0.236 / U:0.140 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site