Re: [PATCH v9 0/5] Initial support for multi-actuator HDDs

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On 2021/10/27 11:38, Jens Axboe wrote:
> On 10/26/21 8:22 PM, Damien Le Moal wrote:
>> From: Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx>
>>
>> Single LUN multi-actuator hard-disks are cappable to seek and execute
>> multiple commands in parallel. This capability is exposed to the host
>> using the Concurrent Positioning Ranges VPD page (SCSI) and Log (ATA).
>> Each positioning range describes the contiguous set of LBAs that an
>> actuator serves.
>>
>> This series adds support to the scsi disk driver to retreive this
>> information and advertize it to user space through sysfs. libata is
>> also modified to handle ATA drives.
>>
>> The first patch adds the block layer plumbing to expose concurrent
>> sector ranges of the device through sysfs as a sub-directory of the
>> device sysfs queue directory. Patch 2 and 3 add support to sd and
>> libata. Finally patch 4 documents the sysfs queue attributed changes.
>> Patch 5 fixes a typo in the document file (strictly speaking, not
>> related to this series).
>>
>> This series does not attempt in any way to optimize accesses to
>> multi-actuator devices (e.g. block IO schedulers or filesystems). This
>> initial support only exposes the independent access ranges information
>> to user space through sysfs.
> 
> I've applied 1/9 for now, as that clearly belongs in the block tree.
> Might be the cleanest if SCSI does a post tree that depends on
> for-5.16/block. Or I can apply it all as they are reviewed. Let me
> know.
> 

Patch 4 & 5 are doc updates and I think they belong to the block tree too.

Patch 3 applies cleanly to libata for-5.16 branch as is, so you can take it, or
I can take it in libata tree too, whichever works for me.

As for patch 2, it applies cleanly to 5.16/scsi-queue so I guess you can take it
too, but I will defer this decision to Martin.


-- 
Damien Le Moal
Western Digital Research




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