linux-kernel - Re: [PATCH v7 11/14] xfs: add xfs_file_dio_write

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Message-ID: <20250423081902.GD28307@lst.de>
Date: Wed, 23 Apr 2025 10:19:02 +0200
From: Christoph Hellwig <hch@....de>
To: "Darrick J. Wong" <djwong@...nel.org>
Cc: John Garry <john.g.garry@...cle.com>, brauner@...nel.org, hch@....de,
	viro@...iv.linux.org.uk, jack@...e.cz, cem@...nel.org,
	linux-fsdevel@...r.kernel.org, dchinner@...hat.com,
	linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	ojaswin@...ux.ibm.com, ritesh.list@...il.com,
	martin.petersen@...cle.com, linux-ext4@...r.kernel.org,
	linux-block@...r.kernel.org, catherine.hoang@...cle.com,
	linux-api@...r.kernel.org
Subject: Re: [PATCH v7 11/14] xfs: add xfs_file_dio_write_atomic()

On Wed, Apr 23, 2025 at 07:42:51AM +0200, Christoph Hellwig wrote:
> On Mon, Apr 21, 2025 at 09:42:41AM -0700, Darrick J. Wong wrote:
> > Well it turns out that was a stupid question -- zoned=1 can't be enabled
> > with reflink, which means there's no cow fallback so atomic writes just
> > plain don't work:
> 
> Exactly.  It is still on my todo list to support it, but there are a
> few higher priority items on it as well, in addition to constant
> interruptions for patch reviews :)

Actually, for zoned we don't need reflink support - as we always write
out place only the stuffing of multiple remaps into a single transaction
is needed.  Still no need to force John to do this work, I can look into
this (probably fairly trivial) work once we have good enough test cases
in xfstests that I can trust them to verify I got things right.