Re: [PATCH 02/21] block: add flag for internal commands

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On 7/8/20 3:27 AM, John Garry wrote:
> On 03/07/2020 14:01, Hannes Reinecke wrote:
> 
> +linux-block
> 
> I figure that linux-block should be cc'ed here
> 
>> Some drivers require to allocate requests for internal command
>> submission. These request will never be passed through the block
>> layer, but nevertheless require a valid tag to avoid them clashing
>> with normal I/O commands.
>> This patch adds a new request flag REQ_INTERNAL to mark such
>> requests and a terminates any such commands in blk_execute_rq_nowait()
>> with a WARN_ON_ONCE to signal such an invalid usage.
>>
>> Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
>> ---
>>   block/blk-exec.c          | 5 +++++
>>   include/linux/blk_types.h | 2 ++
>>   include/linux/blkdev.h    | 5 +++++
>>   3 files changed, 12 insertions(+)
>>
>> diff --git a/block/blk-exec.c b/block/blk-exec.c
>> index 85324d53d072..6869877e0d21 100644
>> --- a/block/blk-exec.c
>> +++ b/block/blk-exec.c
>> @@ -55,6 +55,11 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
>>   	rq->rq_disk = bd_disk;
>>   	rq->end_io = done;
>>   
>> +	if (WARN_ON_ONCE(blk_rq_is_internal(rq))) {
>> +		blk_mq_end_request(rq, BLK_STS_NOTSUPP);
>> +		return;
>> +	}
>> +
>>   	blk_account_io_start(rq);

The whole concept seems very odd, and then there's this seemingly
randomly placed check and error condition. As I haven't seen the
actual use case for this, hard to make suggestions though.

-- 
Jens Axboe




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