linux-kernel - Re: [PATCH RFC 5/6] md/raid1: Handle bio

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Message-ID: <6f61236a-5cbb-a820-31db-b3ea2ec8805a@huaweicloud.com>
Date: Fri, 25 Oct 2024 09:24:31 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: John Garry <john.g.garry@...cle.com>, Yu Kuai <yukuai1@...weicloud.com>,
 axboe@...nel.dk, hch@....de
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-raid@...r.kernel.org, martin.petersen@...cle.com,
 "yangerkun@...wei.com" <yangerkun@...wei.com>,
 "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH RFC 5/6] md/raid1: Handle bio_split() errors

Hi,

在 2024/10/24 21:51, John Garry 写道:
> On 24/10/2024 04:08, Yu Kuai wrote:
>>>
>>> I could just have this pattern:
> 
> Hi Kuai,
> 
>>>
>>> bio->bi_status = errno_to_blk_status(err);
>>> set_bit(R1BIO_Uptodate, &r1_bio->state);
>>> raid_end_bio_io(r1_bio);
>>>
>> I can live with this. 🙂
>>
>>> Is there a neater way to do this?
>>
>> Perhaps add a new filed 'status' in r1bio? And initialize it to
>> BLK_STS_IOERR;
>>
>> Then replace:
>> set_bit(R1BIO_Uptodate, &r1_bio->state);
>> to:
>> r1_bio->status = BLK_STS_OK;
> 
> So are you saying that R1BIO_Uptodate could be dropped then?
> 
>>
>> and change call_bio_endio:
>> bio->bi_status = r1_bio->status;
>>
>> finially here:
>> r1_bio->status = errno_to_blk_status(err);
>> raid_end_bio_io(r1_bio);
> 
> Why not just set bio->bi_status directly?

Because you have to set R1BIO_Uptodate in this case, and this is not
what this flag means.

Like I said, I can live with this, it's up to you. :)

Thanks,
Kuai

> 
> Cheers,
> John
> 
> 
> .
>