linux-ext4 - Re: [PATCH 0/10 v9] No wait AIO

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Message-ID: <acb0fc57-5005-4422-9c42-3345e892ecb2@suse.de>
Date:   Sun, 28 May 2017 21:38:27 -0500
From:   Goldwyn Rodrigues <rgoldwyn@...e.de>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     linux-fsdevel@...r.kernel.org, jack@...e.com,
        linux-block@...r.kernel.org, linux-btrfs@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org,
        axboe@...nel.dk, linux-api@...r.kernel.org,
        adam.manzanares@....com, viro@...iv.linux.org.uk
Subject: Re: [PATCH 0/10 v9] No wait AIO



On 05/28/2017 04:27 AM, Christoph Hellwig wrote:
>>  Changes since v8:
>>  + Err out AIO reads with -EINVAL flagged as RWF_NOWAIT
> 
> Ugg, why?  Reads aren't really treated any different than writes in
> the direct I/O code.

This effort focused on writes only.

>From the point of view of the application/user, reads are usually
required to complete with success. I don't see a scenario where reads()
would need the nowait feature. If there is a use case, I'd be happy to
add and support it.

-- 
Goldwyn