linux-kernel - Re: [PATCH 3/5] block: remove support for the host aware zone model

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Message-ID: <190f58f7-2ed6-46f8-af59-5e167a0bddeb@kernel.org>
Date: Mon, 18 Dec 2023 15:53:06 +0900
From: Damien Le Moal <dlemoal@...nel.org>
To: Ed Tsai (蔡宗軒) <Ed.Tsai@...iatek.com>,
 "hch@....de" <hch@....de>, "axboe@...nel.dk" <axboe@...nel.dk>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "virtualization@...ts.linux.dev" <virtualization@...ts.linux.dev>,
 "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
 Casper Li (李中榮) <casper.li@...iatek.com>,
 Chun-Hung Wu (巫駿宏) <Chun-hung.Wu@...iatek.com>,
 "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
 "dm-devel@...ts.linux.dev" <dm-devel@...ts.linux.dev>,
 "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
 "pbonzini@...hat.com" <pbonzini@...hat.com>,
 "linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
 "linux-f2fs-devel@...ts.sourceforge.net"
 <linux-f2fs-devel@...ts.sourceforge.net>,
 "stefanha@...hat.com" <stefanha@...hat.com>
Subject: Re: [PATCH 3/5] block: remove support for the host aware zone model

On 2023/12/18 15:15, Ed Tsai (蔡宗軒) wrote:
> Hi Christoph,
> 
> some minor suggestions:
> 
> On Sun, 2023-12-17 at 17:53 +0100, Christoph Hellwig wrote:
>>
>> diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
>> index 198d38b53322c1..260b5b8f2b0d7e 100644
>> --- a/drivers/md/dm-table.c
>> +++ b/drivers/md/dm-table.c
>> @@ -1579,21 +1579,18 @@ bool dm_table_has_no_data_devices(struct
>> dm_table *t)
>>  	return true;
>>  }
>>  
>> -static int device_not_zoned_model(struct dm_target *ti, struct
>> dm_dev *dev,
>> -				  sector_t start, sector_t len, void
>> *data)
>> +static int device_not_zoned(struct dm_target *ti, struct dm_dev
>> *dev,
>> +			    sector_t start, sector_t len, void *data)
>>  {
>> -	struct request_queue *q = bdev_get_queue(dev->bdev);
>> -	enum blk_zoned_model *zoned_model = data;
>> +	bool *zoned = data;
>>  
>> -	return blk_queue_zoned_model(q) != *zoned_model;
>> +	return bdev_is_zoned(dev->bdev) != *zoned;
>>  }
>>  
>>  static int device_is_zoned_model(struct dm_target *ti, struct dm_dev
>> *dev,
>>  				 sector_t start, sector_t len, void
>> *data)
> 
> Seems like the word "model" should also be remove here.
> 
>>  {
>> -	struct request_queue *q = bdev_get_queue(dev->bdev);
>> -
>> -	return blk_queue_zoned_model(q) != BLK_ZONED_NONE;
>> +	return bdev_is_zoned(dev->bdev);
>>  }
>>  
>>  /*
>> @@ -1603,8 +1600,7 @@ static int device_is_zoned_model(struct
>> dm_target *ti, struct dm_dev *dev,
>>   * has the DM_TARGET_MIXED_ZONED_MODEL feature set, the devices can
>> have any
>>   * zoned model with all zoned devices having the same zone size.
>>   */
>> -static bool dm_table_supports_zoned_model(struct dm_table *t,
>> -					  enum blk_zoned_model
>> zoned_model)
>> +static bool dm_table_supports_zoned(struct dm_table *t, bool zoned)
>>  {
>>  	for (unsigned int i = 0; i < t->num_targets; i++) {
>>  		struct dm_target *ti = dm_table_get_target(t, i);
>> @@ -1623,11 +1619,11 @@ static bool
>> dm_table_supports_zoned_model(struct dm_table *t,
>>  
>>  		if (dm_target_supports_zoned_hm(ti->type)) {
>>  			if (!ti->type->iterate_devices ||
>> -			    ti->type->iterate_devices(ti,
>> device_not_zoned_model,
>> -						      &zoned_model))
>> +			    ti->type->iterate_devices(ti,
>> device_not_zoned,
>> +						      &zoned))
>>  				return false;
>>  		} else if (!dm_target_supports_mixed_zoned_model(ti-
>>> type)) {
>> -			if (zoned_model == BLK_ZONED_HM)
>> +			if (zoned)
>>  				return false;
>>  		}
>>  	}
> 
> The parameter "bool zoned" is redundant. It should be removed from the
> above 3 functions
> 
> Additionally, because we no longer need to distinguish the zoned model
> here, DM_TARGET_MIXED_ZONED_MODEL is meaningless. We can also clean up
> its related code.

Nope. The mixed thing is for mixing up non-zoned with zoned models.
For the entire DM code, HM and HA are both treated as HM-like zoned.

-- 
Damien Le Moal
Western Digital Research