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SubjectRe: [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 ( 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 <>
> Signed-off-by: Balbir Singh <>
> Signed-off-by: Someswarudu Sangaraju <>

Any feedback on the RFC?

Balbir Singh.
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