On Tue, Apr 11, 2017 at 04:04:59PM -0400, Konrad Rzeszutek Wilk wrote:
> On Tue, Apr 11, 2017 at 12:24:09PM -0700, Marc Olson wrote:
> > When a blkfront device is resized from dom0, emit a KOBJ_CHANGE uevent to
> > notify the guest about the change. This allows for custom udev rules, such
> > as automatically resizing a filesystem, when an event occurs.
>
> Looks pretty reasonable.
>
> Could you confirm what the udevadm --monitor --kernel --udev emits when this
> happens?
Relevant output:
KERNEL[577.206230] change /devices/vbd-51728/block/xvdb (block)
UDEV [577.226218] change /devices/vbd-51728/block/xvdb (block)
Of course, this is missing without the patch.
/marc
>
> Thanks!
>
> >
> > Signed-off-by: Marc Olson
> > ---
> > drivers/block/xen-blkfront.c | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
> > index 2fee2ee..66abf9c 100644
> > --- a/drivers/block/xen-blkfront.c
> > +++ b/drivers/block/xen-blkfront.c
> > @@ -1996,6 +1996,7 @@ static void blkfront_connect(struct blkfront_info
> > *info)
> > unsigned long sector_size;
> > unsigned int physical_sector_size;
> > unsigned int binfo;
> > + char *envp[] = { "RESIZE=1", NULL };
> > int err;
> >
> > switch (info->connected) {
> > @@ -2012,6 +2013,8 @@ static void blkfront_connect(struct blkfront_info
> > *info)
> >sectors);
> > set_capacity(info->gd, sectors);
> > revalidate_disk(info->gd);
> > + kobject_uevent_env(&disk_to_dev(info->gd)->kobj,
> > + KOBJ_CHANGE, envp);
> >
> > return;
> > case BLKIF_STATE_SUSPENDED:
> > --
> > 2.7.4
> >
>
