From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Mon, 18 Sep 2017 17:49:39 +0200
From: Christoph Hellwig <hch@lst.de>
To: Michael Moy <michael@moysys.com>
Cc: axboe@kernel.dk, hch@lst.de, linux-nvme@lists.infradead.org,
	linux-block@vger.kernel.org
Subject: Re: [PATCH v2] fs: pass the write life time hint to the mapped
	filesystem
Message-ID: <20170918154939.GA13431@lst.de>
References: <2f7829a5-d47b-e6a0-cc10-8b534e9772ab@moysys.com>
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List-ID: <linux-block@vger.kernel.org>

On Mon, Sep 18, 2017 at 09:45:57AM -0600, Michael Moy wrote:
> The write hint needs to be copied to the mapped filesystem
> so it can be passed down to the nvme device driver.
>
> v2: fix tabs in the email

If you want the write hint for buffered I/O you need to set it on the
inode using F_SET_RW_HINT.

With your patch we'd magically move the file hint to the inode hint
on each write.