linux-ext4 - Re: [RFC 2/3] ext2: Convert ext2 regular file buffered I/O to use iomap

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Date: Wed, 22 Nov 2023 05:11:18 -0800
From: Christoph Hellwig <hch@...radead.org>
To: Jan Kara <jack@...e.cz>
Cc: "Ritesh Harjani (IBM)" <ritesh.list@...il.com>,
	linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [RFC 2/3] ext2: Convert ext2 regular file buffered I/O to use
 iomap

On Wed, Nov 22, 2023 at 01:29:46PM +0100, Jan Kara wrote:
> writeback bit set. XFS plays the revalidation sequence counter games
> because of this so we'd have to do something similar for ext2. Not that I'd
> care as much about ext2 writeback performance but it should not be that
> hard and we'll definitely need some similar solution for ext4 anyway. Can
> you give that a try (as a followup "performance improvement" patch).

Darrick has mentioned that he is looking into lifting more of the
validation sequence counter validation into iomap.

In the meantime I have a series here that at least maps multiple blocks
inside a folio in a single go, which might be worth trying with ext2 as
well:

http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/iomap-map-multiple-blocks