Re: [Qemu-devel] [PATCH 2/5] scsi-disk: report resized disk via sense codes

[Kevin Wolf]

Am 16.07.2012 16:25, schrieb Paolo Bonzini:
> Linux will not use these, but a very similar mechanism will be used to
> report the condition via virtio-scsi events.
> 
> Signed-off-by: Paolo Bonzini <address@hidden>
> ---
>  hw/scsi-bus.c  |    5 +++++
>  hw/scsi-disk.c |   15 +++++++++++----
>  hw/scsi.h      |    2 ++
>  3 files changed, 18 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/scsi-bus.c b/hw/scsi-bus.c
> index 8b961f2..2547c50 100644
> --- a/hw/scsi-bus.c
> +++ b/hw/scsi-bus.c
> @@ -1161,6 +1161,11 @@ const struct SCSISense sense_code_LUN_FAILURE = {
>      .key = ABORTED_COMMAND, .asc = 0x3e, .ascq = 0x01
>  };
>  
> +/* Unit attention, Capacity data has changed */
> +const struct SCSISense sense_code_CAPACITY_CHANGED = {
> +    .key = UNIT_ATTENTION, .asc = 0x2a, .ascq = 0x09
> +};
> +
>  /* Unit attention, Power on, reset or bus device reset occurred */
>  const struct SCSISense sense_code_RESET = {
>      .key = UNIT_ATTENTION, .asc = 0x29, .ascq = 0x00
> diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
> index 42bae3b..0905446 100644
> --- a/hw/scsi-disk.c
> +++ b/hw/scsi-disk.c
> @@ -1863,6 +1863,13 @@ static void scsi_destroy(SCSIDevice *dev)
>      blockdev_mark_auto_del(s->qdev.conf.bs);
>  }
>  
> +static void scsi_disk_resize_cb(void *opaque)
> +{
> +    SCSIDiskState *s = opaque;
> +
> +    scsi_device_set_ua(&s->qdev, SENSE_CODE(CAPACITY_CHANGED));
> +}
> +
>  static void scsi_cd_change_media_cb(void *opaque, bool load)
>  {
>      SCSIDiskState *s = opaque;
> @@ -1904,11 +1911,13 @@ static bool scsi_cd_is_medium_locked(void *opaque)
>      return ((SCSIDiskState *)opaque)->tray_locked;
>  }
>  
> -static const BlockDevOps scsi_cd_block_ops = {
> +static const BlockDevOps scsi_disk_block_ops = {
>      .change_media_cb = scsi_cd_change_media_cb,
>      .eject_request_cb = scsi_cd_eject_request_cb,
>      .is_tray_open = scsi_cd_is_tray_open,
>      .is_medium_locked = scsi_cd_is_medium_locked,
> +
> +    .resize_cb = scsi_disk_resize_cb,
>  };
>  
>  static void scsi_disk_unit_attention_reported(SCSIDevice *dev)
> @@ -1956,9 +1965,7 @@ static int scsi_initfn(SCSIDevice *dev)
>          return -1;
>      }
>  
> -    if (s->features & (1 << SCSI_DISK_F_REMOVABLE)) {
> -        bdrv_set_dev_ops(s->qdev.conf.bs, &scsi_cd_block_ops, s);
> -    }
> +    bdrv_set_dev_ops(s->qdev.conf.bs, &scsi_disk_block_ops, s);

Are you aware of this code?

bool bdrv_dev_has_removable_media(BlockDriverState *bs)
{
    return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb);
}

This means that now all SCSI disks have removable media from the
monitor's point of view.

Kevin