linux-ext4 - Re: [PATCH 2/8] nowait aio: Introduce RWF

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Message-ID: <2d816e3e-3625-7ebd-8550-68a7cc9c1a2e@suse.de>
Date:   Wed, 19 Apr 2017 05:30:24 -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,
        sagi@...mberg.me, avi@...lladb.com, axboe@...nel.dk,
        linux-api@...r.kernel.org, willy@...radead.org,
        tom.leiming@...il.com
Subject: Re: [PATCH 2/8] nowait aio: Introduce RWF_NOWAIT



On 04/19/2017 01:39 AM, Christoph Hellwig wrote:
> 
>> @@ -1593,6 +1593,11 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
>>  	}
>>  
>>  	req->common.ki_flags |= iocb_rw_flags(iocb->aio_rw_flags);
>> +	if ((req->common.ki_flags & IOCB_NOWAIT) &&
>> +	    !(req->common.ki_flags & IOCB_DIRECT)) {
>> +			ret = -EINVAL;
>> +			goto out_put_req;
>> +		}
> 
> Wrong indentation.  Also I think this should be EOPNOTSUPP here.
> 

Do we plan to add support for nowait in buffered I/O in the future? It
is just too complicated. EINVAL suits best in this case.

-- 
Goldwyn