ask the disk about unmap (read trim) parameters. check if we have the

required vpd pages, then read them for the values we want.

we look for the max blocks per unmap, the max descriptors per unmap, and
which scsi command to use for unmapping (unmap will be preferred).

two fixes and ok matthew@

1 files changed, 3 insertions, 1 deletions

diff --git a/sys/scsi/sdvar.h b/sys/scsi/sdvar.h
index 13b7c47ee3c..f723a7e9729 100644
--- a/sys/scsi/sdvar.h
+++ b/sys/scsi/sdvar.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: sdvar.h,v 1.37 2011/07/11 00:22:15 dlg Exp $	*/
+/*	$OpenBSD: sdvar.h,v 1.38 2011/07/11 06:26:09 dlg Exp $	*/
 /*	$NetBSD: sdvar.h,v 1.7 1998/08/17 00:49:03 mycroft Exp $	*/
 
 /*-
@@ -66,6 +66,8 @@ struct sd_softc {
 		u_long	sectors;	/* number of sectors/track */
 		u_long	secsize;	/* number of bytes/sector */
 		daddr64_t	disksize;	/* total number sectors */
+		u_int32_t	unmap_sectors;	/* maximum sectors/unmap */
+		u_int32_t	unmap_descs;	/* maximum descriptors/unmap */
 	} params;
 	void *sc_sdhook;		/* our shutdown hook */
 	struct timeout sc_timeout;