Re: [PATCH 10/26] dm: Use the block layer zone append emulation

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On 2/6/24 05:33, Mike Snitzer wrote:
> On Mon, Feb 05 2024 at 12:38P -0500,
> Damien Le Moal <dlemoal@xxxxxxxxxx> wrote:
> 
>> On 2/4/24 02:58, Mike Snitzer wrote:
>>> Love the overall improvement to the DM core code and the broader block
>>> layer by switching to this bio-based ZWP approach.
>>>
>>> Reviewed-by: Mike Snitzer <snitzer@xxxxxxxxxx>
>>
>> Thanks Mike !
>>
>>> But one incremental suggestion inlined below.
>>
>> I made this change, but in a lightly different form as I noticed that I was
>> getting compile errors when CONFIG_BLK_DEV_ZONED is disabled.
>> The change look like this now:
>>
>> static void dm_split_and_process_bio(struct mapped_device *md,
>> 				     struct dm_table *map, struct bio *bio)
>> {
>> 	...
>> 	need_split = is_abnormal = is_abnormal_io(bio);
>> 	if (static_branch_unlikely(&zoned_enabled))
>> 		need_split = is_abnormal || dm_zone_bio_needs_split(md, bio);
>>
>> 	...
>>
>> 	/*
>> 	 * Use the block layer zone write plugging for mapped devices that
>> 	 * need zone append emulation (e.g. dm-crypt).
>> 	 */
>> 	if (static_branch_unlikely(&zoned_enabled) &&
>> 	    dm_zone_write_plug_bio(md, bio))
>> 		return;
>>
>> 	...
>>
>> with these added to dm-core.h:
>>
>> static inline bool dm_zone_bio_needs_split(struct mapped_device *md,
>> 					   struct bio *bio)
>> {
>> 	return md->emulate_zone_append && bio_straddle_zones(bio);
>> }
>> static inline bool dm_zone_write_plug_bio(struct mapped_device *md,
>> 					  struct bio *bio)
>> {
>> 	return md->emulate_zone_append && blk_zone_write_plug_bio(bio, 0);
>> }
>>
>> These 2 helpers define to "return false" for !CONFIG_BLK_DEV_ZONED.
>> I hope this works for you. Otherwise, I will drop your review tag when posting V2.
> 
> Why expose them in dm-core.h ?
> 
> Just have what you point in dm-core.h above dm_split_and_process_bio in dm.c ?

I wanted to avoid "#ifdef CONFIG_BLK_DEV_ZONED" in the .c files. But if you are
OK with that, I can move these inline functions in dm.c.


-- 
Damien Le Moal
Western Digital Research





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