diff options
| -rw-r--r-- | drivers/scsi/scsi_sysfs.c | 74 | ||||
| -rw-r--r-- | include/scsi/scsi_device.h | 1 | ||||
| -rw-r--r-- | include/scsi/scsi_proto.h | 12 |
3 files changed, 87 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c index 7e57800684e8..c5ac1719d89d 100644 --- a/drivers/scsi/scsi_sysfs.c +++ b/drivers/scsi/scsi_sysfs.c @@ -81,6 +81,33 @@ const char *scsi_host_state_name(enum scsi_host_state state) return name; } +static const struct { + unsigned char 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" }, +}; + +const char *scsi_access_state_name(unsigned char 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; @@ -973,6 +1000,43 @@ 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); + unsigned char access_state; + const char *access_state_name; + + if (!sdev->handler) + return -EINVAL; + + access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK); + access_state_name = scsi_access_state_name(access_state); + + return sprintf(buf, "%s\n", + access_state_name ? access_state_name : "unknown"); +} +static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL); + +static ssize_t +sdev_show_preferred_path(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct scsi_device *sdev = to_scsi_device(dev); + + if (!sdev->handler) + return -EINVAL; + + if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED) + return sprintf(buf, "1\n"); + else + return sprintf(buf, "0\n"); +} +static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL); #endif static ssize_t @@ -1020,6 +1084,14 @@ static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj, !sdev->host->hostt->change_queue_depth) return 0; +#ifdef CONFIG_SCSI_DH + if (attr == &dev_attr_access_state.attr && + !sdev->handler) + return 0; + if (attr == &dev_attr_preferred_path.attr && + !sdev->handler) + return 0; +#endif return attr->mode; } @@ -1063,6 +1135,8 @@ static struct attribute *scsi_sdev_attrs[] = { &dev_attr_wwid.attr, #ifdef CONFIG_SCSI_DH &dev_attr_dh_state.attr, + &dev_attr_access_state.attr, + &dev_attr_preferred_path.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 4af2b240c4d1..c067019ed12a 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -201,6 +201,7 @@ struct scsi_device { struct scsi_device_handler *handler; void *handler_data; + unsigned char 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 a9fbf1b38e71..c2ae21cbaa2c 100644 --- a/include/scsi/scsi_proto.h +++ b/include/scsi/scsi_proto.h @@ -277,5 +277,17 @@ struct scsi_lun { __u8 scsi_lun[8]; }; +/* SPC asymmetric access states */ +#define SCSI_ACCESS_STATE_OPTIMAL 0x00 +#define SCSI_ACCESS_STATE_ACTIVE 0x01 +#define SCSI_ACCESS_STATE_STANDBY 0x02 +#define SCSI_ACCESS_STATE_UNAVAILABLE 0x03 +#define SCSI_ACCESS_STATE_LBA 0x04 +#define SCSI_ACCESS_STATE_OFFLINE 0x0e +#define SCSI_ACCESS_STATE_TRANSITIONING 0x0f + +/* Values for REPORT TARGET GROUP STATES */ +#define SCSI_ACCESS_STATE_MASK 0x0f +#define SCSI_ACCESS_STATE_PREFERRED 0x80 #endif /* _SCSI_PROTO_H_ */ |