linux-kernel - Re: [RFC PATCH] block/genhd: Notify udev about capacity change

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Date:   Wed, 11 Dec 2019 19:36:09 +0000
From:   "Singh, Balbir" <sblbir@...zon.com>
To:     "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>
CC:     "hch@....de" <hch@....de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "mst@...hat.com" <mst@...hat.com>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "Sangaraju, Someswarudu" <ssomesh@...zon.com>
Subject: Re: [RFC PATCH] block/genhd: Notify udev about capacity change

On Tue, 2019-12-10 at 03:01 +0000, Balbir Singh wrote:
> Allow block/genhd to notify user space (via udev) about disk size changes
> using a new helper disk_set_capacity(), which is a wrapper on top
> of set_capacity(). disk_set_capacity() will only notify via udev if
> the current capacity or the target capacity is not zero.
> 
> disk_set_capacity() is not enabled for all devices, just virtio block,
> xen-blockfront, nvme and sd. Owners of other block disk devices can
> easily move over by changing set_capacity() to disk_set_capacity()
> 
> 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.
> 
> Testing:
> 1. I did some basic testing with an NVME device, by resizing it in
> the backend and ensured that udevd received the event.
> 
> Suggested-by: Christoph Hellwig <hch@....de>
> Signed-off-by: Balbir Singh <sblbir@...zon.com>
> Signed-off-by: Someswarudu Sangaraju <ssomesh@...zon.com>
> 

Any feedback on the RFC?

Balbir Singh.