linux-kernel - Re: [PATCH v20 00/12] Implement copy offload support

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Date: Wed, 5 Jun 2024 10:14:07 +0200
From: Christoph Hellwig <hch@....de>
To: Damien Le Moal <dlemoal@...nel.org>
Cc: Hannes Reinecke <hare@...e.de>, Christoph Hellwig <hch@....de>,
	Nitesh Shetty <nj.shetty@...sung.com>, Jens Axboe <axboe@...nel.dk>,
	Jonathan Corbet <corbet@....net>, Alasdair Kergon <agk@...hat.com>,
	Mike Snitzer <snitzer@...nel.org>,
	Mikulas Patocka <mpatocka@...hat.com>,
	Keith Busch <kbusch@...nel.org>, Sagi Grimberg <sagi@...mberg.me>,
	Chaitanya Kulkarni <kch@...dia.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
	martin.petersen@...cle.com, bvanassche@....org, david@...morbit.com,
	damien.lemoal@...nsource.wdc.com, anuj20.g@...sung.com,
	joshi.k@...sung.com, nitheshshetty@...il.com, gost.dev@...sung.com,
	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, dm-devel@...ts.linux.dev,
	linux-nvme@...ts.infradead.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v20 00/12] Implement copy offload support

On Tue, Jun 04, 2024 at 04:39:25PM +0900, Damien Le Moal wrote:
> > But I wasn't aware that this approach is limited to copying within a 
> > single block devices; that would be quite pointless indeed.
> 
> Not pointless for any FS doing CoW+Rebalancing of block groups (e.g. btrfs) and
> of course GC for FSes on zoned devices. But for this use case, an API allowing
> multiple sources and one destination would be better.

Yes.