From: Christoph Hellwig <hch@lst.de>
To: Damien Le Moal <Damien.LeMoal@hgst.com>
Cc: Christoph Hellwig <hch@lst.de>,
Amir Goldstein <amir73il@gmail.com>,
Ming Lei <ming.lei@canonical.com>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
linux-block <linux-block@vger.kernel.org>,
Jens Axboe <axboe@fb.com>
Subject: Re: Question about loop device DIO/AIO and FLUSH
Date: Fri, 1 Jul 2016 07:04:55 +0200 [thread overview]
Message-ID: <20160701050455.GA828@lst.de> (raw)
In-Reply-To: <E8DEFE4F-67B6-4A9A-83F0-3AA554AEFFB1@hgst.com>
On Fri, Jul 01, 2016 at 05:00:18AM +0000, Damien Le Moal wrote:
> Did you mean "...I/O requests that have already been fully submitted" ?
No.
> Flushing I/Os that have already completed does not seem
> to make much sense. Or I am also missing something...
With a volatile write cache this makes a lot of sense. And fsync
flushes the volatile fs metadata to disk, while flush flushes the
volatile disk write cache.
next prev parent reply other threads:[~2016-07-01 5:04 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-30 20:54 Question about loop device DIO/AIO and FLUSH Amir Goldstein
2016-07-01 4:25 ` Christoph Hellwig
2016-07-01 5:00 ` Damien Le Moal
2016-07-01 5:04 ` Christoph Hellwig [this message]
2016-07-01 5:17 ` Damien Le Moal
2016-07-01 5:32 ` Christoph Hellwig
2016-07-01 5:35 ` Damien Le Moal
2016-07-01 6:57 ` Ming Lei
2016-07-03 8:26 ` Amir Goldstein
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