summaryrefslogtreecommitdiff
path: root/drivers/scsi/st.h
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/scsi/st.h')
-rw-r--r--drivers/scsi/st.h22
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/scsi/st.h b/drivers/scsi/st.h
index f3eee0f9f40c..b6486b5d8681 100644
--- a/drivers/scsi/st.h
+++ b/drivers/scsi/st.h
@@ -92,6 +92,27 @@ struct st_partstat {
int drv_file;
};
+/* Tape statistics */
+struct scsi_tape_stats {
+ atomic64_t read_byte_cnt; /* bytes read */
+ atomic64_t write_byte_cnt; /* bytes written */
+ atomic64_t in_flight; /* Number of I/Os in flight */
+ atomic64_t read_cnt; /* Count of read requests */
+ atomic64_t write_cnt; /* Count of write requests */
+ atomic64_t other_cnt; /* Count of other requests either
+ * implicit or from user space
+ * ioctl. */
+ atomic64_t resid_cnt; /* Count of resid_len > 0 */
+ atomic64_t tot_read_time; /* ktime spent completing reads */
+ atomic64_t tot_write_time; /* ktime spent completing writes */
+ atomic64_t tot_io_time; /* ktime spent doing any I/O */
+ ktime_t read_time; /* holds ktime request was queued */
+ ktime_t write_time; /* holds ktime request was queued */
+ ktime_t other_time; /* holds ktime request was queued */
+ atomic_t last_read_size; /* Number of bytes issued for last read */
+ atomic_t last_write_size; /* Number of bytes issued for last write */
+};
+
#define ST_NBR_PARTITIONS 4
/* The tape drive descriptor */
@@ -171,6 +192,7 @@ struct scsi_tape {
#endif
struct gendisk *disk;
struct kref kref;
+ struct scsi_tape_stats *stats;
};
/* Bit masks for use_pf */