linux-kernel - Re: [RFC PATCH] f2fs: preserve direct write semantics when buffering is forced

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Date:   Mon, 20 Mar 2023 06:42:08 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Hans Holmberg <hans.holmberg@....com>
Cc:     Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>,
        linux-f2fs-devel@...ts.sourceforge.net, damien.lemoal@....com,
        aravind.ramesh@....com, hans@...tronix.com,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] f2fs: preserve direct write semantics when buffering
 is forced

On Mon, Feb 20, 2023 at 01:20:04PM +0100, Hans Holmberg wrote:
> A) Supporting proper direct writes for zoned block devices would
> be the best, but it is currently not supported (probably for
> a good but non-obvious reason). Would it be feasible to
> implement proper direct IO?

I don't think why not.  In many ways direct writes to zoned devices
should be easier than non-direct writes.

Any comments from the maintainers why the direct I/O writes to zoned
devices are disabled?  I could not find anything helpful in the comments
or commit logs.