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;
--
2.23.0
