[PATCH 4/6] block: add a rq_list type

[Jens Axboe]

On 11/14/24 1:11 PM, Nathan Chancellor wrote:
> Hi Christoph,
> 
> On Wed, Nov 13, 2024 at 04:20:44PM +0100, Christoph Hellwig wrote:
>> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
>> index 65f37ae70712..ce8b65503ff0 100644
>> --- a/include/linux/blkdev.h
>> +++ b/include/linux/blkdev.h
>> @@ -1006,6 +1006,11 @@ extern void blk_put_queue(struct request_queue *);
>>  void blk_mark_disk_dead(struct gendisk *disk);
>>  
>>  #ifdef CONFIG_BLOCK
>> +struct rq_list {
>> +	struct request *head;
>> +	struct request *tail;
>> +};
>> +
>>  /*
>>   * blk_plug permits building a queue of related requests by holding the I/O
>>   * fragments for a short period. This allows merging of sequential requests
>> @@ -1018,10 +1023,10 @@ void blk_mark_disk_dead(struct gendisk *disk);
>>   * blk_flush_plug() is called.
>>   */
>>  struct blk_plug {
>> -	struct request *mq_list; /* blk-mq requests */
>> +	struct rq_list mq_list; /* blk-mq requests */
>>  
>>  	/* if ios_left is > 1, we can batch tag/rq allocations */
>> -	struct request *cached_rq;
>> +	struct rq_list cached_rqs;
>>  	u64 cur_ktime;
>>  	unsigned short nr_ios;
>>  
>> @@ -1683,7 +1688,7 @@ int bdev_thaw(struct block_device *bdev);
>>  void bdev_fput(struct file *bdev_file);
>>  
>>  struct io_comp_batch {
>> -	struct request *req_list;
>> +	struct rq_list req_list;
> 
> This change as commit a3396b99990d ("block: add a rq_list type") in
> next-20241114 causes errors when CONFIG_BLOCK is disabled because the
> definition of 'struct rq_list' is under CONFIG_BLOCK. Should it be moved
> out?
> 
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index 00212e96261a..a1fd0ddce5cf 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -1006,12 +1006,12 @@ extern void blk_put_queue(struct request_queue *);
>  
>  void blk_mark_disk_dead(struct gendisk *disk);
>  
> -#ifdef CONFIG_BLOCK
>  struct rq_list {
>  	struct request *head;
>  	struct request *tail;
>  };
>  
> +#ifdef CONFIG_BLOCK
>  /*
>   * blk_plug permits building a queue of related requests by holding the I/O
>   * fragments for a short period. This allows merging of sequential requests
> 

Fix looks fine, but I can't apply a patch that hasn't been signed off.
Please send one, or I'll just have to sort it out manually as we're
really close to this code shipping.


-- 
Jens Axboe