summaryrefslogtreecommitdiff
path: root/drivers/scsi/virtio_scsi.c
diff options
context:
space:
mode:
authorPaolo Bonzini <pbonzini@redhat.com>2012-10-02 17:25:48 +0200
committerJames Bottomley <JBottomley@Parallels.com>2012-10-09 11:24:47 +0100
commit865b58c05b841964f48f574c2027311bd04db8a1 (patch)
tree2559fdb2e8b8191caf97900be89758230f394607 /drivers/scsi/virtio_scsi.c
parent9da5f5ac6affad8dd8cd80f5cca26e4335e1728b (diff)
[SCSI] virtio-scsi: support online resizing of disks
Support the LUN parameter change event. Currently, the host fires this event when the capacity of a disk is changed from the virtual machine monitor. The resize then appears in the kernel log like this: sd 0:0:0:0: [sda] 46137344 512-byte logical blocks: (23.6 GB/22.0 GIb) sda: detected capacity change from 22548578304 to 23622320128 Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/virtio_scsi.c')
-rw-r--r--drivers/scsi/virtio_scsi.c31
1 files changed, 30 insertions, 1 deletions
diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index a7cf726bc747..595af1ae4421 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -279,6 +279,31 @@ static void virtscsi_handle_transport_reset(struct virtio_scsi *vscsi,
}
}
+static void virtscsi_handle_param_change(struct virtio_scsi *vscsi,
+ struct virtio_scsi_event *event)
+{
+ struct scsi_device *sdev;
+ struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev);
+ unsigned int target = event->lun[1];
+ unsigned int lun = (event->lun[2] << 8) | event->lun[3];
+ u8 asc = event->reason & 255;
+ u8 ascq = event->reason >> 8;
+
+ sdev = scsi_device_lookup(shost, 0, target, lun);
+ if (!sdev) {
+ pr_err("SCSI device %d 0 %d %d not found\n",
+ shost->host_no, target, lun);
+ return;
+ }
+
+ /* Handle "Parameters changed", "Mode parameters changed", and
+ "Capacity data has changed". */
+ if (asc == 0x2a && (ascq == 0x00 || ascq == 0x01 || ascq == 0x09))
+ scsi_rescan_device(&sdev->sdev_gendev);
+
+ scsi_device_put(sdev);
+}
+
static void virtscsi_handle_event(struct work_struct *work)
{
struct virtio_scsi_event_node *event_node =
@@ -297,6 +322,9 @@ static void virtscsi_handle_event(struct work_struct *work)
case VIRTIO_SCSI_T_TRANSPORT_RESET:
virtscsi_handle_transport_reset(vscsi, event);
break;
+ case VIRTIO_SCSI_T_PARAM_CHANGE:
+ virtscsi_handle_param_change(vscsi, event);
+ break;
default:
pr_err("Unsupport virtio scsi event %x\n", event->event);
}
@@ -737,7 +765,8 @@ static struct virtio_device_id id_table[] = {
};
static unsigned int features[] = {
- VIRTIO_SCSI_F_HOTPLUG
+ VIRTIO_SCSI_F_HOTPLUG,
+ VIRTIO_SCSI_F_CHANGE,
};
static struct virtio_driver virtio_scsi_driver = {