[PATCH v3 1/1] ntdll: Detect the optical disc type on Linux using a SCSI command.

[Alex Henrie]

From: Alex Henrie

SCSI command 0xAD (GPCMD_READ_DVD_STRUCTURE) with the eighth byte of the
command set to 0x00 (DVD_STRUCT_PHYSICAL) returns physical disc
information for DVDs and blu-rays. On success, the command returns
status 0, and for ordinary CDs, the command returns the error status
0x02 (SAM_STAT_CHECK_CONDITION). The format of the data returned is
different for blu-rays than for DVDs, and the second byte of the command
indicates whether to return DVD information or blu-ray information. (My
LG WH16NS40 drive actually ignores the second byte when there is a DVD
in the drive, but it returns SAM_STAT_CHECK_CONDITION when there is a
blu-ray in the drive and the second byte is not 0x01.) Windows does not
distinguish between DVDs and blu-rays in IOCTL_DISK_GET_MEDIA_TYPES, so
if the SCSI command succeeds for either disc type, report
FILE_DEVICE_DVD.

More specific media information is still not implemented.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=57790
---
 dlls/ntdll/unix/cdrom.c | 36 +++++++++++++++++++++++++++++++++---
 1 file changed, 33 insertions(+), 3 deletions(-)

diff --git a/dlls/ntdll/unix/cdrom.c b/dlls/ntdll/unix/cdrom.c
index 5a700940ceb..677a1b9a012 100644
--- a/dlls/ntdll/unix/cdrom.c
+++ b/dlls/ntdll/unix/cdrom.c
@@ -758,11 +758,41 @@ static NTSTATUS CDROM_GetDriveGeometry(int dev, int fd, DISK_GEOMETRY* dg)
  *		CDROM_GetMediaType
  *
  */
-static NTSTATUS CDROM_GetMediaType(int dev, GET_MEDIA_TYPES* medtype)
+static NTSTATUS CDROM_GetMediaType(int dev, int fd, GET_MEDIA_TYPES* medtype)
 {
-    FIXME(": faking success\n");
+    FIXME("semi-stub\n");
     medtype->DeviceType = FILE_DEVICE_CD_ROM;
     medtype->MediaInfoCount = 0;
+
+#if defined(HAVE_SG_IO_HDR_T_INTERFACE_ID) && defined(HAVE_LINUX_CDROM_H)
+    for (unsigned char disc_type = 0 /* DVD */; disc_type <= 1 /* blu-ray */; disc_type++)
+    {
+        unsigned char buf[255];
+        unsigned char read_disc_struct_cmd[12] = { GPCMD_READ_DVD_STRUCTURE, disc_type, 0x00, 0x00, 0x00, 0x00,
+                                                   0x00, DVD_STRUCT_PHYSICAL, 0x00, sizeof(buf) };
+        sg_io_hdr_t iocmd =
+        {
+            .interface_id = 'S',
+            .dxfer_direction = SG_DXFER_FROM_DEV,
+            .cmd_len = sizeof(read_disc_struct_cmd),
+            .dxfer_len = sizeof(buf),
+            .dxferp = buf,
+            .cmdp = read_disc_struct_cmd,
+            .timeout = 1000,
+        };
+        int err;
+
+        if ((err = ioctl(fd, SG_IO, &iocmd)))
+            return CDROM_GetStatusCode(err);
+
+        if (iocmd.status == 0)
+        {
+            medtype->DeviceType = FILE_DEVICE_DVD;
+            break;
+        }
+    }
+#endif
+
     return STATUS_SUCCESS;
 }

@@ -2908,7 +2938,7 @@ NTSTATUS cdrom_DeviceIoControl( HANDLE device, HANDLE event, PIO_APC_ROUTINE apc
         sz = sizeof(GET_MEDIA_TYPES);
         if (in_buffer != NULL || in_size != 0) status = STATUS_INVALID_PARAMETER;
         else if (out_size < sz) status = STATUS_BUFFER_TOO_SMALL;
-        else status = CDROM_GetMediaType(dev, out_buffer);
+        else status = CDROM_GetMediaType(dev, fd, out_buffer);
         break;

case IOCTL_STORAGE_GET_DEVICE_NUMBER: