Re: [PATCH v2 0/5] Add support for block disk resize notification

Jens Axboe
2020-03-12T14:06:18Z

On 3/2/20 9:03 PM, Singh, Balbir wrote:
> On Tue, 2020-02-25 at 20:01 +0000, Balbir Singh wrote:
>> Allow block/genhd to notify user space about disk size changes using a
>> new helper set_capacity_revalidate_and_notify(), which is a wrapper
>> on top of set_capacity(). set_capacity_revalidate_and_notify() will only
>> notify
>> iff the current capacity or the target capacity is not zero and the
>> capacity really changes.
>>
>> Background:
>>
>> As a part of a patch to allow sending the RESIZE event on disk capacity
>> change, Christoph (hch@lst.de) requested that the patch be made generic
>> and the hacks for virtio block and xen block devices be removed and
>> merged via a generic helper.
>>
>> This series consists of 5 changes. The first one adds the basic
>> support for changing the size and notifying. The follow up patches
>> are per block subsystem changes. Other block drivers can add their
>> changes as necessary on top of this series. Since not all devices
>> are resizable, the default was to add a new API and let users
>> slowly convert over as needed.
>>
>> Testing:
>> 1. I did some basic testing with an NVME device, by resizing it in
>> the backend and ensured that udevd received the event.
>>
>>
>> Changelog v2:
>> - Rename disk_set_capacity to set_capacity_revalidate_and_notify
>> - set_capacity_revalidate_and_notify can call revalidate disk
>> if needed, a new bool parameter is passed (suggested by Bob Liu)
>>
>
> Ping? It's not an urgent patchset, I am happy to wait if nothing else is
> needed.

It doesn't apply to the 5.7 branches, can you resend against for-5.7/block?

--
Jens Axboe