Re: [PATCH v2 1/2] iomap: fix handling of dirty folios over unwritten extents

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To: "Darrick J. Wong" <djwong@xxxxxxxxxx>
Subject: Re: [PATCH v2 1/2] iomap: fix handling of dirty folios over unwritten extents
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Wed, 28 Aug 2024 22:43:49 -0700
Cc: Brian Foster <bfoster@xxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, linux-xfs@xxxxxxxxxxxxxxx, josef@xxxxxxxxxxxxxx, david@xxxxxxxxxxxxx
In-reply-to: <20240828222222.GB6224@frogsfrogsfrogs>

On Wed, Aug 28, 2024 at 03:22:22PM -0700, Darrick J. Wong wrote:
> I wonder why gfs2 (aka the other iomap_zero_range user) doesn't have a
> truncate-down flush hammer, but maybe it doesn't support unwritten
> extents?  I didn't find anything obvious when I looked, so

gfs2 does not support unwritten extents.

References:
- [PATCH v2 0/2] iomap: flush dirty cache over unwritten mappings on zero range
  - From: Brian Foster
- [PATCH v2 1/2] iomap: fix handling of dirty folios over unwritten extents
  - From: Brian Foster
- Re: [PATCH v2 1/2] iomap: fix handling of dirty folios over unwritten extents
  - From: Darrick J. Wong

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