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scsi-cd: check ready condition before processing several commands

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This commit is more or less obvious.  What it caused is less obvious:
SCSI CD drives failed to eject under Linux, though for example the
"change" command worked okay.  This happens because of the autoclose
option in the Linux CD-ROM driver.

The actual chain of events is quite complex and somehow involves
udev helpers; the actual command that matters is READ TOC, though
honestly it's not really clear to me how because it should always be
invoked after autoclose, not before.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2012-03-16 19:11:43 +01:00
parent 7725d14679
commit 9bcaf4fe26
1 changed files with 29 additions and 13 deletions
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42
hw/scsi-disk.c
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@ -1152,9 +1152,7 @@ static int scsi_disk_emulate_command(SCSIDiskReq *r)
outbuf = r->iov.iov_base;
switch (req->cmd.buf[0]) {
case TEST_UNIT_READY:
if (s->tray_open || !bdrv_is_inserted(s->qdev.conf.bs)) {
goto not_ready;
}
assert(!s->tray_open && bdrv_is_inserted(s->qdev.conf.bs));
break;
case INQUIRY:
buflen = scsi_disk_emulate_inquiry(req, outbuf);
@ -1209,7 +1207,8 @@ static int scsi_disk_emulate_command(SCSIDiskReq *r)
memset(outbuf, 0, 8);
bdrv_get_geometry(s->qdev.conf.bs, &nb_sectors);
if (!nb_sectors) {
goto not_ready;
scsi_check_condition(r, SENSE_CODE(LUN_NOT_READY));
return -1;
}
if ((req->cmd.buf[8] & 1) == 0 && req->cmd.lba) {
goto illegal_request;
@ -1269,7 +1268,8 @@ static int scsi_disk_emulate_command(SCSIDiskReq *r)
memset(outbuf, 0, req->cmd.xfer);
bdrv_get_geometry(s->qdev.conf.bs, &nb_sectors);
if (!nb_sectors) {
goto not_ready;
scsi_check_condition(r, SENSE_CODE(LUN_NOT_READY));
return -1;
}
if ((req->cmd.buf[14] & 1) == 0 && req->cmd.lba) {
goto illegal_request;
@ -1314,14 +1314,6 @@ static int scsi_disk_emulate_command(SCSIDiskReq *r)
buflen = MIN(buflen, req->cmd.xfer);
return buflen;
not_ready:
if (s->tray_open || !bdrv_is_inserted(s->qdev.conf.bs)) {
scsi_check_condition(r, SENSE_CODE(NO_MEDIUM));
} else {
scsi_check_condition(r, SENSE_CODE(LUN_NOT_READY));
}
return -1;
illegal_request:
if (r->req.status == -1) {
scsi_check_condition(r, SENSE_CODE(INVALID_FIELD));
@ -1355,6 +1347,30 @@ static int32_t scsi_send_command(SCSIRequest *req, uint8_t *buf)
}
#endif
switch (command) {
case INQUIRY:
case MODE_SENSE:
case MODE_SENSE_10:
case RESERVE:
case RESERVE_10:
case RELEASE:
case RELEASE_10:
case START_STOP:
case ALLOW_MEDIUM_REMOVAL:
case GET_CONFIGURATION:
case GET_EVENT_STATUS_NOTIFICATION:
case MECHANISM_STATUS:
case REQUEST_SENSE:
break;
default:
if (s->tray_open || !bdrv_is_inserted(s->qdev.conf.bs)) {
scsi_check_condition(r, SENSE_CODE(NO_MEDIUM));
return 0;
}
break;
}
switch (command) {
case TEST_UNIT_READY:
case INQUIRY: