linux-kernel - Re: [RFC v2 2/2] fs: btrfs: Extends btrfs/raid56 to support up to six parities

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Date:	Mon, 6 Jan 2014 14:12:56 +0000
From:	Chris Mason <clm@...com>
To:	"amadvance@...il.com" <amadvance@...il.com>
CC:	Josef Bacik <jbacik@...com>, "neilb@...e.de" <neilb@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>,
	"linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>
Subject: Re: [RFC v2 2/2] fs: btrfs: Extends btrfs/raid56 to support up to
 six parities

On Mon, 2014-01-06 at 10:31 +0100, Andrea Mazzoleni wrote:
> This patch changes btrfs/raid56.c to use the new raid interface and
> extends its support to an arbitrary number of parities.
> 
> More in details, the two faila/failb failure indexes are now replaced
> with a fail[] vector that keeps track of up to six failures, and now
> the new raid_par() and raid_rec() functions are used to handle with
> parity instead of the old xor/raid6 ones.
> 

Neat.  The faila/failb were always my least favorite part of the btrfs
code ;)  Did you test just raid5/6 or also the higher parity counts?

-chris

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