linux-kernel - Re: [PATCH] BTRFS: Adds an option to select RAID Stripe size

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Message-ID: <20151229170611.GB4227@suse.cz>
Date:	Tue, 29 Dec 2015 18:06:11 +0100
From:	David Sterba <dsterba@...e.cz>
To:	Sanidhya Solanki <jpage.lkml@...il.com>
Cc:	clm@...com, jbacik@...com, linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] BTRFS: Adds an option to select RAID Stripe size

On Tue, Dec 29, 2015 at 06:15:12AM -0500, Sanidhya Solanki wrote:
> On Tue, 29 Dec 2015 14:39:07 +0100
> David Sterba <dsterba@...e.cz> wrote:
> 
> > The stripe size depends on how the filesystem was made, at the moment
> > the stripesize parameter is missing from mkfs. The kernel module
> > should support all sizes at runtime, so it's not a compile-time
> > option.
> 
> No good? I will try and re-implement it as a runtime option.

So you want to make the stripe size configurable? The stripesize is
sotred in the superblock but as the hardcoded value is 64k through the
BTRFS_STRIPE_LEN define, the superblock value is not honored in the
code. I don't know about all implications from changing the define to
sb->stripesize, also we want to define the allowed range etc. It would
be better to add more description to the patch.
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