[PATCH 10/11] scsi: Use BLK_STS_RSV_CONFLICT for reservation conflicts

[Mike Christie <michael.christie@oracle.com>]

This has scsi use BLK_STS_RSV_CONFLICT for reservation conflicts so upper
layers like lio can distinguish this between a general nexus error and a
reservation conflict. For the latter we can then report that error to VMs.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
---
 drivers/scsi/scsi_error.c |  1 -
 drivers/scsi/scsi_lib.c   | 11 ++++++++---
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index cdaca13ac1f1..621627486e5c 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -1985,7 +1985,6 @@ enum scsi_disposition scsi_decide_disposition(struct scsi_cmnd *scmd)
 	case SAM_STAT_RESERVATION_CONFLICT:
 		sdev_printk(KERN_INFO, scmd->device,
 			    "reservation conflict\n");
-		set_host_byte(scmd, DID_NEXUS_FAILURE);
 		return SUCCESS; /* causes immediate i/o error */
 	}
 	return FAILED;
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 8d18cc7e510e..623dc1cee51e 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -597,7 +597,7 @@ static blk_status_t scsi_result_to_blk_status(struct scsi_cmnd *cmd, int result)
 	case DID_OK:
 		if (scsi_status_is_good(result))
 			return BLK_STS_OK;
-		return BLK_STS_IOERR;
+		break;
 	case DID_TRANSPORT_FAILFAST:
 	case DID_TRANSPORT_MARGINAL:
 		return BLK_STS_TRANSPORT;
@@ -613,9 +613,14 @@ static blk_status_t scsi_result_to_blk_status(struct scsi_cmnd *cmd, int result)
 	case DID_MEDIUM_ERROR:
 		set_host_byte(cmd, DID_OK);
 		return BLK_STS_MEDIUM;
-	default:
-		return BLK_STS_IOERR;
 	}
+
+	switch (get_status_byte(cmd)) {
+	case SAM_STAT_RESERVATION_CONFLICT:
+		return BLK_STS_RSV_CONFLICT;
+	}
+
+	return BLK_STS_IOERR;
 }
 
 /**
-- 
2.25.1