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

[Jens Axboe <axboe@kernel.dk>]

On 01/23/2015 10:53 PM, Jeremy Allison wrote:
> On Fri, Jan 23, 2015 at 07:17:05PM -0700, Jens Axboe wrote:
>> On 01/23/2015 04:15 PM, Steve French wrote:
>>> On Mon, Jan 19, 2015 at 10:20 AM, Milosz Tanski <milosz@adfin.com> wrote:
>>>> 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.
>>>
>>> Why not do the async read/write via the kernel client if the license
>>> is an issue?  It already has async SMB2/SMB3 operations
>>> (with a synchronous send/receive-like wrapper).
>>
>> The license issue has been solved. Fio is cross platform, so would
>> be preferable to have this work through libsmbclient, if at all
>> possible.
>
> How did the license issue get solved ? Did I miss some email
> on that ?

Only the cifs engine is linked with libsmbclient, so that particular 
engine can be licensed as v2 or later (or v3, u to Milosz).

-- 
Jens Axboe