[PATCH 006/117] target: Use enum sam_status instead of u8

[Bart Van Assche <bvanassche@acm.org>]

Allow the compiler to verify whether a SAM status code has been specified
where such a code is expected. This patch does not change any functionality
since SAM_STAT_GOOD and GOOD are both symbolic names for the numerical value
0.

Cc: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 drivers/target/loopback/tcm_loop.c     |  2 +-
 drivers/target/target_core_alua.c      |  6 +++---
 drivers/target/target_core_iblock.c    |  2 +-
 drivers/target/target_core_pr.c        |  8 ++++----
 drivers/target/target_core_pscsi.c     |  4 ++--
 drivers/target/target_core_sbc.c       | 10 +++++-----
 drivers/target/target_core_spc.c       | 14 +++++++-------
 drivers/target/target_core_transport.c |  5 +++--
 drivers/target/target_core_xcopy.c     |  2 +-
 include/target/target_core_backend.h   |  4 ++--
 include/target/target_core_base.h      |  3 ++-
 11 files changed, 31 insertions(+), 29 deletions(-)

diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c
index 2687fd7d45db..66ea91c52175 100644
--- a/drivers/target/loopback/tcm_loop.c
+++ b/drivers/target/loopback/tcm_loop.c
@@ -550,7 +550,7 @@ static int tcm_loop_write_pending(struct se_cmd *se_cmd)
 }
 
 static int tcm_loop_queue_data_or_status(const char *func,
-		struct se_cmd *se_cmd, u8 scsi_status)
+		struct se_cmd *se_cmd, enum sam_status scsi_status)
 {
 	struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 				struct tcm_loop_cmd, tl_se_cmd);
diff --git a/drivers/target/target_core_alua.c b/drivers/target/target_core_alua.c
index 5517c7dd5144..3bb921345bce 100644
--- a/drivers/target/target_core_alua.c
+++ b/drivers/target/target_core_alua.c
@@ -123,7 +123,7 @@ target_emulate_report_referrals(struct se_cmd *cmd)
 
 	transport_kunmap_data_sg(cmd);
 
-	target_complete_cmd(cmd, GOOD);
+	target_complete_cmd(cmd, SAM_STAT_GOOD);
 	return 0;
 }
 
@@ -255,7 +255,7 @@ target_emulate_report_target_port_groups(struct se_cmd *cmd)
 	}
 	transport_kunmap_data_sg(cmd);
 
-	target_complete_cmd_with_length(cmd, GOOD, rd_len + 4);
+	target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, rd_len + 4);
 	return 0;
 }
 
@@ -424,7 +424,7 @@ target_emulate_set_target_port_groups(struct se_cmd *cmd)
 out:
 	transport_kunmap_data_sg(cmd);
 	if (!rc)
-		target_complete_cmd(cmd, GOOD);
+		target_complete_cmd(cmd, SAM_STAT_GOOD);
 	return rc;
 }
 
diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
index d6fdd1c61f90..deb2b8b64d20 100644
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -474,7 +474,7 @@ iblock_execute_zero_out(struct block_device *bdev, struct se_cmd *cmd)
 	if (ret)
 		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 
-	target_complete_cmd(cmd, GOOD);
+	target_complete_cmd(cmd, SAM_STAT_GOOD);
 	return 0;
 }
 
diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c
index 6fd5fec95539..4b94b085625b 100644
--- a/drivers/target/target_core_pr.c
+++ b/drivers/target/target_core_pr.c
@@ -234,7 +234,7 @@ target_scsi2_reservation_release(struct se_cmd *cmd)
 out_unlock:
 	spin_unlock(&dev->dev_reservation_lock);
 out:
-	target_complete_cmd(cmd, GOOD);
+	target_complete_cmd(cmd, SAM_STAT_GOOD);
 	return 0;
 }
 
@@ -297,7 +297,7 @@ target_scsi2_reservation_reserve(struct se_cmd *cmd)
 	spin_unlock(&dev->dev_reservation_lock);
 out:
 	if (!ret)
-		target_complete_cmd(cmd, GOOD);
+		target_complete_cmd(cmd, SAM_STAT_GOOD);
 	return ret;
 }
 
@@ -3676,7 +3676,7 @@ target_scsi3_emulate_pr_out(struct se_cmd *cmd)
 	}
 
 	if (!ret)
-		target_complete_cmd(cmd, GOOD);
+		target_complete_cmd(cmd, SAM_STAT_GOOD);
 	return ret;
 }
 
@@ -4073,7 +4073,7 @@ target_scsi3_emulate_pr_in(struct se_cmd *cmd)
 	}
 
 	if (!ret)
-		target_complete_cmd(cmd, GOOD);
+		target_complete_cmd(cmd, SAM_STAT_GOOD);
 	return ret;
 }
 
diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c
index dac44caf77a3..fd617bc4113e 100644
--- a/drivers/target/target_core_pscsi.c
+++ b/drivers/target/target_core_pscsi.c
@@ -588,7 +588,7 @@ static void pscsi_destroy_device(struct se_device *dev)
 	}
 }
 
-static void pscsi_complete_cmd(struct se_cmd *cmd, u8 scsi_status,
+static void pscsi_complete_cmd(struct se_cmd *cmd, enum sam_status scsi_status,
 			       unsigned char *req_sense)
 {
 	struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
@@ -1044,7 +1044,7 @@ static void pscsi_req_done(struct request *req, blk_status_t status)
 	struct se_cmd *cmd = req->end_io_data;
 	struct pscsi_plugin_task *pt = cmd->priv;
 	int result = scsi_req(req)->result;
-	u8 scsi_status = status_byte(result) << 1;
+	enum sam_status scsi_status = status_byte(result) << 1;
 
 	if (scsi_status != SAM_STAT_GOOD) {
 		pr_debug("PSCSI Status Byte exception at cmd: %p CDB:"
diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index 7b07e557dc8d..b32f4ee88e79 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -67,7 +67,7 @@ sbc_emulate_readcapacity(struct se_cmd *cmd)
 		transport_kunmap_data_sg(cmd);
 	}
 
-	target_complete_cmd_with_length(cmd, GOOD, 8);
+	target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, 8);
 	return 0;
 }
 
@@ -130,7 +130,7 @@ sbc_emulate_readcapacity_16(struct se_cmd *cmd)
 		transport_kunmap_data_sg(cmd);
 	}
 
-	target_complete_cmd_with_length(cmd, GOOD, 32);
+	target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, 32);
 	return 0;
 }
 
@@ -202,14 +202,14 @@ sbc_execute_write_same_unmap(struct se_cmd *cmd)
 			return ret;
 	}
 
-	target_complete_cmd(cmd, GOOD);
+	target_complete_cmd(cmd, SAM_STAT_GOOD);
 	return 0;
 }
 
 static sense_reason_t
 sbc_emulate_noop(struct se_cmd *cmd)
 {
-	target_complete_cmd(cmd, GOOD);
+	target_complete_cmd(cmd, SAM_STAT_GOOD);
 	return 0;
 }
 
@@ -1245,7 +1245,7 @@ sbc_execute_unmap(struct se_cmd *cmd)
 err:
 	transport_kunmap_data_sg(cmd);
 	if (!ret)
-		target_complete_cmd(cmd, GOOD);
+		target_complete_cmd(cmd, SAM_STAT_GOOD);
 	return ret;
 }
 
diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c
index 70a661801cb9..0756a690ea84 100644
--- a/drivers/target/target_core_spc.c
+++ b/drivers/target/target_core_spc.c
@@ -750,7 +750,7 @@ spc_emulate_inquiry(struct se_cmd *cmd)
 	kfree(buf);
 
 	if (!ret)
-		target_complete_cmd_with_length(cmd, GOOD, len);
+		target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, len);
 	return ret;
 }
 
@@ -1104,7 +1104,7 @@ static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd)
 		transport_kunmap_data_sg(cmd);
 	}
 
-	target_complete_cmd_with_length(cmd, GOOD, length);
+	target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, length);
 	return 0;
 }
 
@@ -1122,7 +1122,7 @@ static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd)
 	int i;
 
 	if (!cmd->data_length) {
-		target_complete_cmd(cmd, GOOD);
+		target_complete_cmd(cmd, SAM_STAT_GOOD);
 		return 0;
 	}
 
@@ -1165,7 +1165,7 @@ static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd)
 	transport_kunmap_data_sg(cmd);
 
 	if (!ret)
-		target_complete_cmd(cmd, GOOD);
+		target_complete_cmd(cmd, SAM_STAT_GOOD);
 	return ret;
 }
 
@@ -1198,7 +1198,7 @@ static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd)
 	memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
 	transport_kunmap_data_sg(cmd);
 
-	target_complete_cmd(cmd, GOOD);
+	target_complete_cmd(cmd, SAM_STAT_GOOD);
 	return 0;
 }
 
@@ -1265,7 +1265,7 @@ sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd)
 		transport_kunmap_data_sg(cmd);
 	}
 
-	target_complete_cmd_with_length(cmd, GOOD, 8 + lun_count * 8);
+	target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, 8 + lun_count * 8);
 	return 0;
 }
 EXPORT_SYMBOL(spc_emulate_report_luns);
@@ -1273,7 +1273,7 @@ EXPORT_SYMBOL(spc_emulate_report_luns);
 static sense_reason_t
 spc_emulate_testunitready(struct se_cmd *cmd)
 {
-	target_complete_cmd(cmd, GOOD);
+	target_complete_cmd(cmd, SAM_STAT_GOOD);
 	return 0;
 }
 
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 8fbfe75c5744..b55db3a1f94b 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -855,7 +855,7 @@ static bool target_cmd_interrupted(struct se_cmd *cmd)
 }
 
 /* May be called from interrupt context so must not sleep. */
-void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
+void target_complete_cmd(struct se_cmd *cmd, enum sam_status scsi_status)
 {
 	struct se_wwn *wwn = cmd->se_sess->se_tpg->se_tpg_wwn;
 	int success, cpu;
@@ -910,7 +910,8 @@ void target_set_cmd_data_length(struct se_cmd *cmd, int length)
 }
 EXPORT_SYMBOL(target_set_cmd_data_length);
 
-void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
+void target_complete_cmd_with_length(struct se_cmd *cmd,
+				     enum sam_status scsi_status, int length)
 {
 	if (scsi_status == SAM_STAT_GOOD ||
 	    cmd->se_cmd_flags & SCF_TREAT_READ_AS_NORMAL) {
diff --git a/drivers/target/target_core_xcopy.c b/drivers/target/target_core_xcopy.c
index d31ed071cb08..44d76c304701 100644
--- a/drivers/target/target_core_xcopy.c
+++ b/drivers/target/target_core_xcopy.c
@@ -1011,7 +1011,7 @@ static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
 	put_unaligned_be32(42, &p[0]);
 
 	transport_kunmap_data_sg(se_cmd);
-	target_complete_cmd(se_cmd, GOOD);
+	target_complete_cmd(se_cmd, SAM_STAT_GOOD);
 
 	return TCM_NO_SENSE;
 }
diff --git a/include/target/target_core_backend.h b/include/target/target_core_backend.h
index 1f78b09bba55..15e1db779bce 100644
--- a/include/target/target_core_backend.h
+++ b/include/target/target_core_backend.h
@@ -73,9 +73,9 @@ struct sbc_ops {
 int	transport_backend_register(const struct target_backend_ops *);
 void	target_backend_unregister(const struct target_backend_ops *);
 
-void	target_complete_cmd(struct se_cmd *, u8);
+void	target_complete_cmd(struct se_cmd *, enum sam_status);
 void	target_set_cmd_data_length(struct se_cmd *, int);
-void	target_complete_cmd_with_length(struct se_cmd *, u8, int);
+void	target_complete_cmd_with_length(struct se_cmd *, enum sam_status, int);
 
 void	transport_copy_sense_to_cmd(struct se_cmd *, unsigned char *);
 
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index d1f7d2a45354..68accab36b3e 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -8,6 +8,7 @@
 #include <linux/percpu-refcount.h>
 #include <linux/semaphore.h>     /* struct semaphore */
 #include <linux/completion.h>
+#include <scsi/scsi_proto.h>
 
 #define TARGET_CORE_VERSION		"v5.0"
 
@@ -453,7 +454,7 @@ enum target_core_dif_check {
 
 struct se_cmd {
 	/* SAM response code being sent to initiator */
-	u8			scsi_status;
+	enum sam_status		scsi_status;
 	u8			scsi_asc;
 	u8			scsi_ascq;
 	u16			scsi_sense_length;