linux-kernel - Re: [PATCH v0] f2fs: allow direct read for zoned device

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Message-ID: <YuPgIByYgc6WSPDE@infradead.org>
Date:   Fri, 29 Jul 2022 06:26:56 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Eunhee Rho <eunhee83.rho@...sung.com>
Cc:     "jaegeuk@...nel.org" <jaegeuk@...nel.org>,
        "chao@...nel.org" <chao@...nel.org>,
        "linux-f2fs-devel@...ts.sourceforge.net" 
        <linux-f2fs-devel@...ts.sourceforge.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v0] f2fs: allow direct read for zoned device

On Fri, Jul 29, 2022 at 09:25:17AM +0900, Eunhee Rho wrote:
> For zoned devices, f2fs forbids direct IO and forces buffered IO
> to serialize write IOs. However, the constraint does not apply to
> read IOs.

Asymetric capabilitis will cause a whole lot of problems for us.  Can
we figure out why direct writes to zoned devices are not supported and
just fix that instead?