Re: [Lsf-pc] [LSF/MM TOPIC] async buffered diskio read for userspace apps

From: Milosz Tanski <milosz@adfin.com>
To: Volker Lendecke <Volker.Lendecke@sernet.de>
Cc: Jens Axboe <axboe@kernel.dk>,
	James Bottomley <James.Bottomley@hansenpartnership.com>,
	Jeremy Allison <jra@samba.org>, Jan Kara <jack@suse.cz>,
	Christoph Hellwig <hch@infradead.org>,
	linux-mm@kvack.org,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	lsf-pc@lists.linux-foundation.org
Subject: Re: [Lsf-pc] [LSF/MM TOPIC] async buffered diskio read for userspace apps
Date: Mon, 19 Jan 2015 11:20:50 -0500	[thread overview]
Message-ID: <CANP1eJEgbsX2wcREwfcsPmo8k1ZMf-ZXimH19ZsvGCRO+MT-6Q@mail.gmail.com> (raw)
In-Reply-To: <E1YDEuL-000mD3-8B@intern.SerNet.DE>

On Mon, Jan 19, 2015 at 11:10 AM, Volker Lendecke
<Volker.Lendecke@sernet.de> wrote:
> On Mon, Jan 19, 2015 at 08:31:27AM -0700, Jens Axboe wrote:
>> I didn't look at your code yet, but I'm assuming it's a self
>> contained IO engine. So we should be able to make that work, by only
>> linking the engine itself against libsmbclient. But sheesh, what a
>> pain in the butt, why can't we just all be friends.
>
> The published libsmbclient API misses the async features
> that are needed here. Milosz needs to go lower-level.
>
> Volker

Volker, the sync code path works; in fact I pushed some minor
corrections to my branch this morning. And for now using FIO I can
generate multiple clients (threads / processes).

I started working on the async features (SMB2 async read/write) for
client library the samba repo. There's a patch there for the first
step of it it there; see the other email I sent to you and Jeremy. I
was going to make sure it licensed under whatever it needs to get into
the samba repo... and since this is done on my own time I personally
don't care what license it's under provided it's not a PITA.

-- 
Milosz Tanski
CTO
16 East 34th Street, 15th floor
New York, NY 10016

p: 646-253-9055
e: milosz@adfin.com