[PATCH v3 04/30] block: Introduce blk_zone_update_request_bio()

[Damien Le Moal]

On 3/28/24 13:14, Christoph Hellwig wrote:
>> -		if (req_op(req) == REQ_OP_ZONE_APPEND)
>> -			bio->bi_iter.bi_sector = req->__sector;
>> -
>> -		if (!is_flush)
>> +		if (!is_flush) {
>> +			blk_zone_update_request_bio(req, bio);
>>  			bio_endio(bio);
>> +		}
> 
> As noted by Bart last time around, the blk_zone_update_request_bio
> really should stay out of the !is_flush check, as otherwise we'd
> break zone appends going through the flush state machine.

I do not think that is corect. Because is_flush indicates that RQF_FLUSH_SEQ is
set, that is, we are in the middle of a flush sequence. And flush sequence
progression is handled at the request level, not BIOs. Once the sequence
finishes, then and only then the BIO original endio should be done, meaning that
we will then take this path and actually do blk_zone_update_request_bio() and
bio_endio(). So I still think this is correct.

> 
> Otherwise this looks good:
> 
> Reviewed-by: Christoph Hellwig <hch at lst.de>

-- 
Damien Le Moal
Western Digital Research