On 10/23/19 2:52 PM, Michal Suchanek wrote:
> The WMware ESXi cdrom identifies itself as:
> sr 0:0:0:0: [sr0] scsi3-mmc drive: vendor: "NECVMWarVMware SATA CD001.00"
> model: "VMware SATA CD001.00"
> with the following get_capabilities print in sr.c:
> sr_printk(KERN_INFO, cd,
> "scsi3-mmc drive: vendor: \"%s\" model: \"%s\"\n",
> cd->device->vendor, cd->device->model);
>
> So the model looks like reliable identification while vendor does not.
>
> The drive claims to have a tray and claims to be able to close it.
> However, the UI has no notion of a tray - when medium is ejected it is
> dropped in the floor and the user must select a medium again before the
> drive can be re-loaded. On the kernel side the tray_move call to close
> the tray succeeds but the drive state does not change as a result of the
> call.
>
> The drive does not in fact emulate the tray state. There are two ways to
> get the medium state. One is the SCSI status:
>
> Physical drive:
>
> Fixed format, current; Sense key: Not Ready
> Additional sense: Medium not present - tray open
> Raw sense data (in hex):
> 70 00 02 00 00 00 00 0a 00 00 00 00 3a 02 00 00
> 00 00
>
> Fixed format, current; Sense key: Not Ready
> Additional sense: Medium not present - tray closed
> Raw sense data (in hex):
> 70 00 02 00 00 00 00 0a 00 00 00 00 3a 01 00 00
> 00 00
>
> VMware ESXi:
>
> Fixed format, current; Sense key: Not Ready
> Additional sense: Medium not present
> Info fld=0x0 [0]
> Raw sense data (in hex):
> f0 00 02 00 00 00 00 0a 00 00 00 00 3a 00 00 00
> 00 00
>
> So the tray state is not reported here. Other is medium status which the
> kernel prefers if available. Adding a print here gives:
>
> cdrom: get_media_event success: code = 0, door_open = 1, medium_present = 0
>
> door_open is interpreted as open tray. This is fine so long as tray_move
> would close the tray when requested or report an error which never
> happens on VMware ESXi servers (5.5 and 6.5 tested).
>
> This is a popular virtualization platform so a workaround is worthwhile.
>
> Signed-off-by: Michal Suchanek <msuchanek@xxxxxxx>
> ---
> drivers/scsi/sr.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
> index 4664fdf75c0f..8090c5bdec09 100644
> --- a/drivers/scsi/sr.c
> +++ b/drivers/scsi/sr.c
> @@ -867,6 +867,7 @@ static void get_capabilities(struct scsi_cd *cd)
> unsigned int ms_len = 128;
> int rc, n;
>
> + static const char *model_vmware = "VMware";
> static const char *loadmech[] =
> {
> "caddy",
> @@ -922,6 +923,11 @@ static void get_capabilities(struct scsi_cd *cd)
> buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
> buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
> loadmech[buffer[n + 6] >> 5]);
> + if (!strncmp(cd->device->model, model_vmware, strlen(model_vmware))) {
> + buffer[n + 6] &= ~(0xff << 5);
> + sr_printk(KERN_INFO, cd,
> + "VMware ESXi bug workaround: tray -> caddy\n");
> + }
> if ((buffer[n + 6] >> 5) == 0)
> /* caddy drives can't close tray... */
> cd->cdi.mask |= CDC_CLOSE_TRAY;
>
This looks something which should be handled via a blacklist flag, not
some inline hack which everyone forgets about it...
Cheers,
Hannes
--
Dr. Hannes Reinecke Teamlead Storage & Networking
hare@xxxxxxx +49 911 74053 688
SUSE Software Solutions Germany GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 247165 (AG München), GF: Felix Imendörffer
