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Commit 9d9598b8 authored by Milos Vyletel's avatar Milos Vyletel Committed by Rusty Russell
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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: default avatarMilos Vyletel <milos.vyletel@sde.cz>
Tested-by: default avatarAsias He <asias@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (minor simplification)
parent ba06d1e1

drivers/block/virtio_blk.c

+2 −0
Original line number Diff line number Diff line
@@ -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);

}