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

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Date:   Tue, 3 Mar 2020 04:03:45 +0000
From:   "Singh, Balbir" <sblbir@...zon.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>
CC:     "hch@....de" <hch@....de>,
        "Chaitanya.Kulkarni@....com" <Chaitanya.Kulkarni@....com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "mst@...hat.com" <mst@...hat.com>,
        "axboe@...nel.dk" <axboe@...nel.dk>
Subject: Re: [PATCH v2 0/5] Add support for block disk resize notification

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@....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.

Balbir Singh