[PATCH] scsi: Add ALUA state change UA handling

[Hannes Reinecke <hare@suse.de>]

Log the ALUA state change unit attention correctly with
the message log and emit an event to allow user-space
tools to react to it.

Reviewed-by: Ewan Milne <emilne@redhat.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
---
 drivers/scsi/scsi_error.c  | 4 ++++
 drivers/scsi/scsi_lib.c    | 4 ++++
 include/scsi/scsi_device.h | 1 +
 3 files changed, 9 insertions(+)

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index c95a4e9..dc57980 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -421,6 +421,10 @@ static void scsi_report_sense(struct scsi_device *sdev,
 			evt_type = SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED;
 			sdev_printk(KERN_WARNING, sdev,
 				    "Mode parameters changed");
+		} else if (sshdr->asc == 0x2a && sshdr->ascq == 0x06) {
+			evt_type = SDEV_EVT_ALUA_STATE_CHANGE_REPORTED;
+			sdev_printk(KERN_WARNING, sdev,
+				    "Asymmetic access state changed");
 		} else if (sshdr->asc == 0x2a && sshdr->ascq == 0x09) {
 			evt_type = SDEV_EVT_CAPACITY_CHANGE_REPORTED;
 			sdev_printk(KERN_WARNING, sdev,
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index b1a2631..f04be65 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2698,6 +2698,9 @@ static void scsi_evt_emit(struct scsi_device *sdev, struct scsi_event *evt)
 	case SDEV_EVT_CAPACITY_CHANGE_REPORTED:
 		envp[idx++] = "SDEV_UA=CAPACITY_DATA_HAS_CHANGED";
 		break;
+	case SDEV_EVT_ALUA_STATE_CHANGE_REPORTED:
+		envp[idx++] = "SDEV_UA=ASYMMETRIC_ACCESS_STATE_HAS_CHANGED";
+		break;
 	case SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED:
 	       envp[idx++] = "SDEV_UA=THIN_PROVISIONING_SOFT_THRESHOLD_REACHED";
 		break;
@@ -2807,6 +2810,7 @@ struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
 	case SDEV_EVT_MEDIA_CHANGE:
 	case SDEV_EVT_INQUIRY_CHANGE_REPORTED:
 	case SDEV_EVT_CAPACITY_CHANGE_REPORTED:
+	case SDEV_EVT_ALUA_STATE_CHANGE_REPORTED:
 	case SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED:
 	case SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED:
 	case SDEV_EVT_LUN_CHANGE_REPORTED:
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index a4c9336..5d7553f 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -53,6 +53,7 @@ enum scsi_device_state {
 enum scsi_device_event {
 	SDEV_EVT_MEDIA_CHANGE	= 1,	/* media has changed */
 	SDEV_EVT_INQUIRY_CHANGE_REPORTED,		/* 3F 03  UA reported */
+	SDEV_EVT_ALUA_STATE_CHANGE_REPORTED,		/* 2A 06  UA reported */
 	SDEV_EVT_CAPACITY_CHANGE_REPORTED,		/* 2A 09  UA reported */
 	SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED,	/* 38 07  UA reported */
 	SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED,	/* 2A 01  UA reported */
-- 
1.8.5.2