target: Fix unsupported WRITE_SAME sense payload

BugLink: http://bugs.launchpad.net/bugs/981162

commit 67236c44741e250199ccd77f1115568e68cf8848 upstream.

This patch fixes a bug in target-core where unsupported WRITE_SAME ops
from a target_check_write_same_discard() failure was incorrectly
returning CHECK_CONDITION w/ TCM_INVALID_CDB_FIELD sense data.
This was causing some clients to not properly fall back, so go ahead
and use the correct TCM_UNSUPPORTED_SCSI_OPCODE sense for this case.

Reported-by: Martin Svec <martin.svec@zoner.cz>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Leann Ogasawara <leann.ogasawara@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index cdb774b..5660916 100644 (file)
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2666,7 +2666,7 @@ static int transport_generic_cmd_sequencer(
                        cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
 
                        if (target_check_write_same_discard(&cdb[10], dev) < 0)
-                               goto out_invalid_cdb_field;
+                               goto out_unsupported_cdb;
                        if (!passthrough)
                                cmd->execute_task = target_emulate_write_same;
                        break;
@@ -2949,7 +2949,7 @@ static int transport_generic_cmd_sequencer(
                cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
 
                if (target_check_write_same_discard(&cdb[1], dev) < 0)
-                       goto out_invalid_cdb_field;
+                       goto out_unsupported_cdb;
                if (!passthrough)
                        cmd->execute_task = target_emulate_write_same;
                break;
@@ -2972,7 +2972,7 @@ static int transport_generic_cmd_sequencer(
                 * of byte 1 bit 3 UNMAP instead of original reserved field
                 */
                if (target_check_write_same_discard(&cdb[1], dev) < 0)
-                       goto out_invalid_cdb_field;
+                       goto out_unsupported_cdb;
                if (!passthrough)
                        cmd->execute_task = target_emulate_write_same;
                break;