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

Singh, Balbir
2020-03-12T22:51:54Z

On Thu, 2020-03-12 at 08:06 -0600, Jens Axboe wrote:
>
> 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?
>

Thanks, I'll take a look. I used the latest next (next-20200312) and rebased
on it. I got a three way merge success on xen-blkfront

Using index info to reconstruct a base tree...
M drivers/block/xen-blkfront.c
Falling back to patching base and 3-way merge...

I presume you are running into the same thing.

I will resend the patches on top of next shortly

Balbir