Add an 'access_state' attribute to struct scsi_device to
display the asymmetric LUN access state.
Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
---
drivers/scsi/scsi_scan.c | 1 +
drivers/scsi/scsi_sysfs.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++
include/scsi/scsi_device.h | 1 +
include/scsi/scsi_proto.h | 13 ++++++++++++
4 files changed, 64 insertions(+)
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 5d3e2ae..76e771e 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -230,6 +230,7 @@ static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
sdev->lun = lun;
sdev->channel = starget->channel;
sdev->sdev_state = SDEV_CREATED;
+ sdev->access_state = SCSI_ACCESS_STATE_UNKNOWN;
INIT_LIST_HEAD(&sdev->siblings);
INIT_LIST_HEAD(&sdev->same_target_siblings);
INIT_LIST_HEAD(&sdev->cmd_list);
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 37799dc..38e157a 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -81,6 +81,34 @@ const char *scsi_host_state_name(enum scsi_host_state state)
return name;
}
+static const struct {
+ enum scsi_access_state value;
+ char *name;
+} sdev_access_states[] = {
+ { SCSI_ACCESS_STATE_OPTIMAL, "active/optimized" },
+ { SCSI_ACCESS_STATE_ACTIVE, "active/non-optimized" },
+ { SCSI_ACCESS_STATE_STANDBY, "standby" },
+ { SCSI_ACCESS_STATE_UNAVAILABLE, "unavailable" },
+ { SCSI_ACCESS_STATE_LBA, "lba-dependent" },
+ { SCSI_ACCESS_STATE_OFFLINE, "offline" },
+ { SCSI_ACCESS_STATE_TRANSITIONING, "transitioning" },
+ { SCSI_ACCESS_STATE_UNKNOWN, "unknown" },
+};
+
+const char *scsi_access_state_name(enum scsi_access_state state)
+{
+ int i;
+ char *name = NULL;
+
+ for (i = 0; i < ARRAY_SIZE(sdev_access_states); i++) {
+ if (sdev_access_states[i].value == state) {
+ name = sdev_access_states[i].name;
+ break;
+ }
+ }
+ return name;
+}
+
static int check_set(unsigned long long *val, char *src)
{
char *last;
@@ -932,6 +960,26 @@ sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
sdev_store_dh_state);
+
+static ssize_t
+sdev_show_access_state(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct scsi_device *sdev = to_scsi_device(dev);
+ enum scsi_access_state access_state;
+ bool pref = false;
+
+ if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
+ pref = true;
+
+ access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
+
+ return snprintf(buf, 32, "%s%s\n",
+ scsi_access_state_name(access_state),
+ pref ? " preferred" :"");
+}
+static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
#endif
static ssize_t
@@ -1005,6 +1053,7 @@ static struct attribute *scsi_sdev_attrs[] = {
&dev_attr_queue_type.attr,
#ifdef CONFIG_SCSI_DH
&dev_attr_dh_state.attr,
+ &dev_attr_access_state.attr,
#endif
&dev_attr_queue_ramp_up_period.attr,
REF_EVT(media_change),
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index cfc23a4..666359f 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -200,6 +200,7 @@ struct scsi_device {
struct scsi_device_handler *handler;
void *handler_data;
+ enum scsi_access_state access_state;
enum scsi_device_state sdev_state;
unsigned long sdev_data[0];
} __attribute__((aligned(sizeof(unsigned long))));
diff --git a/include/scsi/scsi_proto.h b/include/scsi/scsi_proto.h
index a9fbf1b..80e85e7 100644
--- a/include/scsi/scsi_proto.h
+++ b/include/scsi/scsi_proto.h
@@ -277,5 +277,18 @@ struct scsi_lun {
__u8 scsi_lun[8];
};
+/* SPC asymmetric access states */
+enum scsi_access_state {
+ SCSI_ACCESS_STATE_OPTIMAL = 0,
+ SCSI_ACCESS_STATE_ACTIVE,
+ SCSI_ACCESS_STATE_STANDBY,
+ SCSI_ACCESS_STATE_UNAVAILABLE,
+ SCSI_ACCESS_STATE_LBA,
+ SCSI_ACCESS_STATE_OFFLINE = 0xe,
+ SCSI_ACCESS_STATE_TRANSITIONING = 0xf,
+ SCSI_ACCESS_STATE_UNKNOWN = 0x70,
+};
+#define SCSI_ACCESS_STATE_MASK 0x0f
+#define SCSI_ACCESS_STATE_PREFERRED 0x80
#endif /* _SCSI_PROTO_H_ */
--
1.8.5.6
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