Add MTIOCERRSTAT ioctl and structures that define (at least for

SCSI) the data returned for latched residual and error statistics.
Reserve space for LOG SENSE data which we'll get later. This area
in transition as the HP TapeAlert initiative is looked at.

1 files changed, 35 insertions, 2 deletions

diff --git a/sys/sys/mtio.h b/sys/sys/mtio.h
index b307089..6e4a9d1 100644
--- a/sys/sys/mtio.h
+++ b/sys/sys/mtio.h
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)mtio.h	8.1 (Berkeley) 6/2/93
- * $Id: mtio.h,v 1.11 1998/09/15 10:07:26 gibbs Exp $
+ * $Id: mtio.h,v 1.12 1998/12/17 19:26:49 mjacob Exp $
  */
 
 #ifndef	_SYS_MTIO_H_
@@ -86,7 +86,7 @@ struct mtop {
 #define MT_COMP_ENABLE		0xffffffff
 #define MT_COMP_DISABLED	0xfffffffe
 #define MT_COMP_UNSUPP		0xfffffffd
-#endif
+#endif	/* __FreeBSD__ */
 
 /* structure for MTIOCGET - mag tape get status command */
 
@@ -120,6 +120,37 @@ struct mtget {
 /* end not yet implemented */
 };
 
+/* structure for MTIOCERRSTAT - tape get error status command */
+/* really only supported for SCSI tapes right now */
+struct scsi_tape_errors {
+	/*
+	 * These are latched from the last command that had a SCSI
+	 * Check Condition noted for these operations. The act
+	 * of issuing an MTIOCERRSTAT unlatches and clears them.
+	 */
+	u_int8_t io_sense[32];	/* Last Sense Data For Data I/O */
+	u_int32_t io_resid;	/* residual count from last Data I/O */
+	u_int8_t ctl_sense[32];	/* Last Sense Data For Control I/O */
+	u_int32_t ctl_resid;	/* residual count from last Control I/O */
+	/*
+	 * These are the read and write cumulative error counters.
+	 * (how to reset cumulative error counters is not yet defined).
+	 * (not implemented as yet but space is being reserved for them)
+	 */
+	struct {
+		u_int32_t retries;	/* total # retries performed */
+		u_int32_t corrected;	/* total # corrections performed */
+		u_int32_t processed;	/* total # corrections succssful */
+		u_int32_t failures;	/* total # corrections/retries failed */
+		u_int64_t nbytes;	/* total # bytes processed */
+	} werr, rderr;
+};
+	
+union mterrstat {
+	struct scsi_tape_errors scsi_errstat;
+	char _reserved_padding[256];
+};
+
 /*
  * Constants for mt_type byte.  These are the same
  * for controllers compatible with the types listed.
@@ -148,6 +179,7 @@ struct mtget {
 /* mag tape io control commands */
 #define	MTIOCTOP	_IOW('m', 1, struct mtop)	/* do a mag tape op */
 #define	MTIOCGET	_IOR('m', 2, struct mtget)	/* get tape status */
+/* these two do not appear to be used anywhere */
 #define MTIOCIEOT	_IO('m', 3)			/* ignore EOT error */
 #define MTIOCEEOT	_IO('m', 4)			/* enable EOT error */
 /*
@@ -160,6 +192,7 @@ struct mtget {
 #define	MTIOCRDHPOS	_IOR('m', 6, u_int32_t)	/* get hardware blk addr */
 #define	MTIOCSLOCATE	_IOW('m', 5, u_int32_t)	/* seek to logical blk addr */
 #define	MTIOCHLOCATE	_IOW('m', 6, u_int32_t)	/* seek to hardware blk addr */
+#define	MTIOCERRSTAT	_IOR('m', 7, union mterrstat)	/* get tape errors */
 
 #ifndef KERNEL
 #define	DEFTAPE	"/dev/nrsa0"