Re: [PATCH] Btrfs: Do not use data_alloc_cluster in ssd mode

From: Hans van Kranenburg <hans.van.kranenburg@mendix.com>
To: Adam Borowski <kilobyte@angband.pl>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: [PATCH] Btrfs: Do not use data_alloc_cluster in ssd mode
Date: Fri, 21 Jul 2017 17:16:25 +0200	[thread overview]
Message-ID: <2574118e-ac4d-9788-cf8f-f633d46cfd88@mendix.com> (raw)
In-Reply-To: <20170721144922.2zriwspqixh7yt3l@angband.pl>

On 07/21/2017 04:49 PM, Adam Borowski wrote:
> On Fri, Jul 21, 2017 at 01:47:11PM +0200, Hans van Kranenburg wrote:
>> The changes in here do the following:
>>
>> 1. Throw out the current ssd_spread behaviour.
>> 2. Move the current ssd behaviour to the ssd_spread option.
>> 3. Make ssd mode data allocation identical to tetris mode, like nossd.
>> 4. Adjust and clean up filesystem mount messages so that we can easily
>> identify if a kernel has this patch applied or not, when providing
>> support to end users.
> 
>> Notes for whoever wants to backport this patch on their 4.9 LTS kernel:
>> * First apply commit 8a83665a "btrfs: drop the nossd flag when
>>   remounting with -o ssd", or fixup the differences manually.
> 
> It's 951e7966 in mainline.  I see no 8a83665a anywhere -- most likely it's
> what you got after cherry-picking to 4.9.

Yes, that's exactly where it went wrong, thanks.

-- 
Hans van Kranenburg