Messages in this thread Patch in this message | | | From | Rusty Russell <> | Subject | Re: [PATCH] virtio-blk: emit udev event when device is resized | Date | Wed, 27 Feb 2013 11:07:20 +1030 |
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Milos Vyletel <milos.vyletel@sde.cz> writes:
> When virtio-blk device is resized from host (using block_resize from QEMU) emit > KOBJ_CHANGE uevent to notify guest about such change. This allows user to have > custom udev rules which would take whatever action if such event occurs. As a > proof of concept I've created simple udev rule that automatically resize > filesystem on virtio-blk device. > > ACTION=="change", KERNEL=="vd*", \ > ENV{RESIZE}=="1", \ > ENV{ID_FS_TYPE}=="ext[3-4]", \ > RUN+="/sbin/resize2fs /dev/%k" > ACTION=="change", KERNEL=="vd*", \ > ENV{RESIZE}=="1", \ > ENV{ID_FS_TYPE}=="LVM2_member", \ > RUN+="/sbin/pvresize /dev/%k" > > Signed-off-by: Milos Vyletel <milos.vyletel@sde.cz>
OK, I collapsed the event[] line as suggested by Asias, and applied this.
Thanks, Rusty.
From: Milos Vyletel <milos.vyletel@sde.cz> Subject: virtio-blk: emit udev event when device is resized
When virtio-blk device is resized from host (using block_resize from QEMU) emit KOBJ_CHANGE uevent to notify guest about such change. This allows user to have custom udev rules which would take whatever action if such event occurs. As a proof of concept I've created simple udev rule that automatically resize filesystem on virtio-blk device.
ACTION=="change", KERNEL=="vd*", \ ENV{RESIZE}=="1", \ ENV{ID_FS_TYPE}=="ext[3-4]", \ RUN+="/sbin/resize2fs /dev/%k" ACTION=="change", KERNEL=="vd*", \ ENV{RESIZE}=="1", \ ENV{ID_FS_TYPE}=="LVM2_member", \ RUN+="/sbin/pvresize /dev/%k"
Signed-off-by: Milos Vyletel <milos.vyletel@sde.cz> Tested-by: Asias He <asias@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (minor simplification)
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index 8ad21a2..922bcb9 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -539,6 +539,7 @@ static void virtblk_config_changed_work(struct work_struct *work) struct virtio_device *vdev = vblk->vdev; struct request_queue *q = vblk->disk->queue; char cap_str_2[10], cap_str_10[10]; + char *envp[] = { "RESIZE=1", NULL }; u64 capacity, size; mutex_lock(&vblk->config_lock); @@ -568,6 +569,7 @@ static void virtblk_config_changed_work(struct work_struct *work) set_capacity(vblk->disk, capacity); revalidate_disk(vblk->disk); + kobject_uevent_env(&disk_to_dev(vblk->disk)->kobj, KOBJ_CHANGE, envp); done: mutex_unlock(&vblk->config_lock); }
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