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

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Message-Id: <87msv5r0uq.fsf@doe.com>
Date: Thu, 23 Nov 2023 01:56:21 +0530
From: Ritesh Harjani (IBM) <ritesh.list@...il.com>
To: Christoph Hellwig <hch@...radead.org>, Jan Kara <jack@...e.cz>
Cc: 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

Christoph Hellwig <hch@...radead.org> writes:

> 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

Sure, thanks for providing details. I will check this.

-ritesh