linux-kernel - Re: [PATCH v3 0/4] btrfs: RAID stripe tree updates

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Message-ID: <20231004131452.GB28758@suse.cz>
Date:   Wed, 4 Oct 2023 15:14:52 +0200
From:   David Sterba <dsterba@...e.cz>
To:     Johannes Thumshirn <johannes.thumshirn@....com>
Cc:     Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>, Qu Wenru <wqu@...e.com>,
        Damien Le Moal <dlemoal@...nel.org>,
        Naohiro Aota <naohiro.aota@....com>,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/4] btrfs: RAID stripe tree updates

On Wed, Oct 04, 2023 at 12:56:15AM -0700, Johannes Thumshirn wrote:
> This batch of RST updates contains the on-disk format changes Qu
> suggested. It drastically simplifies the write and path, especially for
> RAID10.
> 
> Instead of recording all strides of a striped RAID into one stripe tree
> entry, we create multiple entries per stride. This allows us to remove the
> length in the stride as we can use the length from the key. Using this
> method RAID10 becomes RAID1 and RAID0 becomes single from the point of
> view of the stripe tree.
> 
> ---
> - Link to first batch: https://lore.kernel.org/r/20230918-rst-updates-v1-0-17686dc06859@wdc.com
> - Link to second batch: https://lore.kernel.org/r/20230920-rst-updates-v2-0-b4dc154a648f@wdc.com
> 
> ---
> Johannes Thumshirn (4):
>       btrfs: change RST write
>       btrfs: remove stride length check on read
>       btrfs: remove raid stride length in tree printer
>       btrfs: remove stride length from on-disk format

Folded to the commits, thanks.