linux-ext4 - Re: [PATCH 1/8] nowait aio: Introduce IOCB_RW_FLAG

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Date:   Mon, 3 Apr 2017 23:48:27 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Goldwyn Rodrigues <rgoldwyn@...e.de>
Cc:     linux-fsdevel@...r.kernel.org, jack@...e.com, hch@...radead.org,
        linux-block@...r.kernel.org, linux-btrfs@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org,
        sagi@...mberg.me, avi@...lladb.com, axboe@...nel.dk,
        linux-api@...r.kernel.org, willy@...radead.org,
        tom.leiming@...il.com, Goldwyn Rodrigues <rgoldwyn@...e.com>
Subject: Re: [PATCH 1/8] nowait aio: Introduce IOCB_RW_FLAG_NOWAIT

On Mon, Apr 03, 2017 at 01:53:00PM -0500, Goldwyn Rodrigues wrote:
> From: Goldwyn Rodrigues <rgoldwyn@...e.com>
> 
> This flag informs kernel to bail out if an AIO request will block
> for reasons such as file allocations, or a writeback triggered,
> or would block while allocating requests while performing
> direct I/O.
> 
> Unfortunately, aio_flags is not checked for validity, which would
> break existing applications which have it set to anything besides zero
> or IOCB_FLAG_RESFD. So, we are using aio_reserved1 and renaming it
> to aio_rw_flags.
> 
> IOCB_RW_FLAG_NOWAIT is translated to IOCB_NOWAIT for
> iocb->ki_flags.

Please make this a flag in the RWF_* namespace, and as a preparation
support the existing RWF_* flags for aio.