linux-kernel - submit bio directly from userspace

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Message-ID: <20151007144253.GA26518@kmu-tp-x230>
Date:	Wed, 7 Oct 2015 17:42:53 +0300
From:	Mike Krinkin <krinkin.m.u@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	axboe@...nel.dk, hch@....de, kmo@...erainc.com,
	dmonakhov@...nvz.org
Subject: submit bio directly from userspace

Hi,

i'm developing block layer workload simulator/player and need to
generate bios as close as possible to the ones in original workload.
To play workload i employ aio + O_DIRECT, but all IOs end up as bios
with SYNC flag set. So i wonder is there any way to control bios
flags from userspace or, maybe, any other options to generate
workload from userspace except aio + O_DIRECT with more precise
control over bio flags?
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