Re: [PATCH 05/17] block: export blkdev_zone_mgmt_all

[Damien Le Moal <damien.lemoal@opensource.wdc.com>]

On 7/5/22 11:31, Damien Le Moal wrote:
> On 7/4/22 21:44, Christoph Hellwig wrote:
>> Export blkdev_zone_mgmt_all so that the nvme target can use it instead
>> of duplicating the functionality.
>>
>> Signed-off-by: Christoph Hellwig <hch@lst.de>
> 
> Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>

Actually, looking again at this, if we generalize
blkdev_zone_reset_all_emulated() into blkdev_zone_mgmt_all(), we should
not allocate the need_reset bitmap if op is not reset. And the emulation
for open/close/finish all is a bit tricky as we have to look at the
current state of the zones, so we still need the report. The bitmat should
this be something like "do_op" and the bits in it set using a helper for
the zone depending on the op. Then using that function as is in nvmet will
work. Otherwise, as-is, I think it will break something in nvmet.

> 
>> ---
>>  block/blk-zoned.c      | 10 +++++-----
>>  include/linux/blkdev.h |  2 ++
>>  2 files changed, 7 insertions(+), 5 deletions(-)
>>
>> diff --git a/block/blk-zoned.c b/block/blk-zoned.c
>> index 90a5c9cc80ab3..7fbe395fa51fc 100644
>> --- a/block/blk-zoned.c
>> +++ b/block/blk-zoned.c
>> @@ -185,8 +185,8 @@ static int blk_zone_need_reset_cb(struct blk_zone *zone, unsigned int idx,
>>  	}
>>  }
>>  
>> -static int blkdev_zone_reset_all_emulated(struct block_device *bdev,
>> -					  gfp_t gfp_mask)
>> +int blkdev_zone_mgmt_all(struct block_device *bdev, unsigned int op,
>> +			 gfp_t gfp_mask)
>>  {
>>  	struct request_queue *q = bdev_get_queue(bdev);
>>  	sector_t capacity = get_capacity(bdev->bd_disk);
>> @@ -213,8 +213,7 @@ static int blkdev_zone_reset_all_emulated(struct block_device *bdev,
>>  			continue;
>>  		}
>>  
>> -		bio = blk_next_bio(bio, bdev, 0, REQ_OP_ZONE_RESET | REQ_SYNC,
>> -				   gfp_mask);
>> +		bio = blk_next_bio(bio, bdev, 0, op | REQ_SYNC, gfp_mask);
>>  		bio->bi_iter.bi_sector = sector;
>>  		sector += zone_sectors;
>>  
>> @@ -231,6 +230,7 @@ static int blkdev_zone_reset_all_emulated(struct block_device *bdev,
>>  	kfree(need_reset);
>>  	return ret;
>>  }
>> +EXPORT_SYMBOL_GPL(blkdev_zone_mgmt_all);
>>  
>>  static int blkdev_zone_reset_all(struct block_device *bdev, gfp_t gfp_mask)
>>  {
>> @@ -295,7 +295,7 @@ int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op,
>>  	 */
>>  	if (op == REQ_OP_ZONE_RESET && sector == 0 && nr_sectors == capacity) {
>>  		if (!blk_queue_zone_resetall(q))
>> -			return blkdev_zone_reset_all_emulated(bdev, gfp_mask);
>> +			return blkdev_zone_mgmt_all(bdev, op, gfp_mask);
>>  		return blkdev_zone_reset_all(bdev, gfp_mask);
>>  	}
>>  
>> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
>> index 270cd0c552924..b9baee910b825 100644
>> --- a/include/linux/blkdev.h
>> +++ b/include/linux/blkdev.h
>> @@ -302,6 +302,8 @@ unsigned int blkdev_nr_zones(struct gendisk *disk);
>>  extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op,
>>  			    sector_t sectors, sector_t nr_sectors,
>>  			    gfp_t gfp_mask);
>> +int blkdev_zone_mgmt_all(struct block_device *bdev, unsigned int op,
>> +			 gfp_t gfp_mask);
>>  int blk_revalidate_disk_zones(struct gendisk *disk,
>>  			      void (*update_driver_data)(struct gendisk *disk));
>>  
> 
> 


-- 
Damien Le Moal
Western Digital Research