Re: [PATCH 0/7] Add support for storage element depopulation

[Damien Le Moal <dlemoal@kernel.org>]

On 2026/10/05 13:13, Hannes Reinecke wrote:
> On 10/5/26 11:46 AM, Damien Le Moal wrote:
>> Jens,
>>
>> These patches define a new set of block device operations for generically
>> using from the block layer the storage element depopulation feature of
>> zoned block devices. Support for this feature is added to the SCSI disk
>> driver and an emulation of this feature added to the zloop driver.
>>
>> The management operations can be accessed using block layer API, which is
>> intended for file systems (e.g. zonefs and XFS), as well as using ioctls
>> for users using zoned disks directly from user space.
>>
>> Damien Le Moal (7):
>>    block: fail reads to offline zones early
>>    block: introduce storage element management
>>    block: add storage element management ioctls
>>    zloop: add storage element emulation
>>    zloop: add degrade_element control command
>>    scsi: sd_zbc: always revalidate zones for disks supporting head depopulation
>>    scsi: sd_zbc: define storage element management operations
>>
> I wonder: shouldn't we send a uevent after either operation?
> I guess that this would be helpful for admins, and not forgetting
> udev which might want to re-run any rules the admin might have
> configured.

Maybe. But given that head depop is a user/sysadmin initiated operation, at
least for now, udev/revalidation is something that the user/sysadmin can trigger
too for now.

In the next round, once we get file systems (zonefs and xfs) to initiate depop,
we can add such event notification.



-- 
Damien Le Moal
Western Digital Research