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

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Message-ID: <ZBzPYwcoLXkFngz8@google.com>
Date:   Thu, 23 Mar 2023 15:14:59 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Hans Holmberg <hans.holmberg@....com>, 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 03/20, Christoph Hellwig wrote:
> 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.

The direct IO wants to overwrite the data on the same block address, while
zoned device does not support it?