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authorMilos Vyletel <milos.vyletel@sde.cz>2013-03-12 09:04:40 +0400
committerRusty Russell <rusty@rustcorp.com.au>2013-03-12 09:14:55 +0400
commit9d9598b81c5c05495009e81ac0508ec8d1558015 (patch)
treebd4b367e3332908f0a1111e743efce3006e9ed43 /drivers/block/virtio_blk.c
parentba06d1e1d3350a38476ea6b7655ba7c047baad67 (diff)
downloadlinux-9d9598b81c5c05495009e81ac0508ec8d1558015.tar.xz
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)
Diffstat (limited to 'drivers/block/virtio_blk.c')
-rw-r--r--drivers/block/virtio_blk.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 8ad21a25bc0d..922bcb97e23a 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);
}