target: Fail UNMAP when emulate_tpu=0

This patch adds a check within sbc_parse_cdb() to fail a UNMAP op,
if the backend device has emulate_tpu disabled.

Cc: Martin Petersen <martin.petersen@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index 0d307c3..9661a66 100644 (file)
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -962,6 +962,11 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
                if (!ops->execute_unmap)
                        return TCM_UNSUPPORTED_SCSI_OPCODE;
 
+               if (!dev->dev_attrib.emulate_tpu) {
+                       pr_err("Got UNMAP, but backend device has"
+                              " emulate_tpu disabled\n");
+                       return TCM_UNSUPPORTED_SCSI_OPCODE;
+               }
                size = get_unaligned_be16(&cdb[7]);
                cmd->execute_cmd = ops->execute_unmap;
                break;