[Qemu-devel] [PATCH 09/14] scsi: parse 16-byte tape CDBs

[Paolo Bonzini <pbonzini@redhat.com>]

The transfer length for these commands is different from the transfer
length of the corresponding disk commands, so parse it specially.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
        READ REVERSE(16) seems to be for people who stream manga from tape.

 hw/scsi-bus.c  |   10 ++++++++++
 hw/scsi-defs.h |    1 +
 2 files changed, 11 insertions(+)

diff --git a/hw/scsi-bus.c b/hw/scsi-bus.c
index 5fbf8db..46cd1f9 100644
--- a/hw/scsi-bus.c
+++ b/hw/scsi-bus.c
@@ -891,6 +891,16 @@ static int scsi_req_stream_length(SCSICommand *cmd, SCSIDevice *dev, uint8_t *bu
             cmd->xfer *= dev->blocksize;
         }
         break;
+    case READ_16:
+    case READ_REVERSE_16:
+    case VERIFY_16:
+    case WRITE_16:
+        cmd->len = 16;
+        cmd->xfer = buf[14] | (buf[13] << 8) | (buf[12] << 16);
+        if (buf[1] & 0x01) { /* fixed */
+            cmd->xfer *= dev->blocksize;
+        }
+        break;
     case REWIND:
     case START_STOP:
         cmd->len = 6;
diff --git a/hw/scsi-defs.h b/hw/scsi-defs.h
index ca24192..219c84d 100644
--- a/hw/scsi-defs.h
+++ b/hw/scsi-defs.h
@@ -92,6 +92,7 @@
 #define PERSISTENT_RESERVE_OUT 0x5f
 #define VARLENGTH_CDB         0x7f
 #define WRITE_FILEMARKS_16    0x80
+#define READ_REVERSE_16       0x81
 #define ALLOW_OVERWRITE       0x82
 #define EXTENDED_COPY         0x83
 #define ATA_PASSTHROUGH       0x85
-- 
1.7.9.3