lkml.org 
[lkml]   [2013]   [Aug]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] aoe: adjust ref of head for compound page tails
On Wed, 7 Aug 2013 17:21:32 -0400 Ed Cashin <ecashin@coraid.com> wrote:

> > What are the end-user-visible effects of the problem which is being
> > fixed? Please always include this info when fixing bugs so that others
> > can work out what kernel version(s) need the patch.
>
>
> Sorry. I tried to cover that but maybe should have separated it more clearly from the running text.
>
> The patch changes the current behavior encountered with direct I/O and aoe:
>
> aoe can BUG when direct I/O used
>
> ... to a new behavior:
>
> aoe does not BUG when direct I/O is used
>
> And the user will never know that instead aoe is manipulating the _count of the head page, even though that's what's happening with this patch applied.
>
> (The user-visible effects that motivated the older patch that added the BUG to aoe when page tails are used for block I/O was a VM_BUG_ON that occurred when the aoe driver manipulated the _count of a compound page tail.)

OK, I added "Fix a BUG which can trigger when direct-IO is used with
AOE". Which kernel versions are affected?



\
 
 \ /
  Last update: 2013-08-08 00:01    [W:0.068 / U:1.624 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site