linux-kernel - Re: [PATCH] fs: fix lost error code in dio

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Date:   Thu, 1 Nov 2018 09:03:19 +0100
From:   Maximilian Heyne <mheyne@...zon.de>
To:     "Shah, Amit" <aams@...zon.de>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Woodhouse, David" <dwmw@...zon.co.uk>, "hch@....de" <hch@....de>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "Dannowski, Uwe" <uwed@...zon.de>,
        "Mehlan, Torsten" <tomeh@...zon.de>
Subject: Re: [PATCH] fs: fix lost error code in dio_complete

On 10/31/18 10:24 AM, Shah, Amit wrote:
> On Di, 2018-10-30 at 21:57 +0000, Maximilian Heyne wrote:
>> [...]
>>
>> diff --git a/fs/direct-io.c b/fs/direct-io.c
>> index 093fb54cd316..199146036093 100644
>> --- a/fs/direct-io.c
>> +++ b/fs/direct-io.c
>> @@ -325,8 +325,8 @@ static ssize_t dio_complete(struct dio *dio, ssize_t ret, unsigned int flags)
>>   		 */
>>   		dio->iocb->ki_pos += transferred;
>>   
>> -		if (dio->op == REQ_OP_WRITE)
>> -			ret = generic_write_sync(dio->iocb,  transferred);
>> +		if (ret > 0 && dio->op == REQ_OP_WRITE)
>> +			ret = generic_write_sync(dio->iocb, ret);
> Is the s/transferred/ret/ change necessary?  Needs explaining, at least.

In an above code line `ret` is set to `transferred`. So the change is
a no op. However, in my opinion the construct then looks cleaner.

>>   		dio->iocb->ki_complete(dio->iocb, ret, 0);
>>   	}
>>   
> Thanks,
>
>
>
> 				Amit



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