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From: Alexander Motin <mav@FreeBSD.org>
Date: Fri, 26 Mar 2010 10:18:19 +0000 (UTC)
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Subject: svn commit: r205680 - head/sys/dev/ata
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Author: mav
Date: Fri Mar 26 10:18:19 2010
New Revision: 205680
URL: http://svn.freebsd.org/changeset/base/205680

Log:
  Use last 16 bytes of serial number in metadata instead of first ones,
  same as Intel MatrixRAID does.
  
  PR:		kern/124064

Modified:
  head/sys/dev/ata/ata-raid.c

Modified: head/sys/dev/ata/ata-raid.c
==============================================================================
--- head/sys/dev/ata/ata-raid.c	Fri Mar 26 08:47:07 2010	(r205679)
+++ head/sys/dev/ata/ata-raid.c	Fri Mar 26 10:18:19 2010	(r205680)
@@ -2568,8 +2568,15 @@ ata_raid_intel_read_meta(device_t dev, s
 	if (meta->generation >= raid->generation) {
 	    for (disk = 0; disk < raid->total_disks; disk++) {
 		struct ata_device *atadev = device_get_softc(parent);
+		int len;
 
-		if (!strncmp(raid->disks[disk].serial, atadev->param.serial,
+		for (len = 0; len < sizeof(atadev->param.serial); len++) {
+		    if (atadev->param.serial[len] < 0x20)
+			break;
+		}
+		len = (len > sizeof(raid->disks[disk].serial)) ?
+		    len - sizeof(raid->disks[disk].serial) : 0;
+		if (!strncmp(raid->disks[disk].serial, atadev->param.serial + len,
 		    sizeof(raid->disks[disk].serial))) {
 		    raid->disks[disk].dev = parent;
 		    raid->disks[disk].flags |= (AR_DF_PRESENT | AR_DF_ONLINE);
@@ -2639,8 +2646,15 @@ ata_raid_intel_write_meta(struct ar_soft
 		device_get_softc(device_get_parent(rdp->disks[disk].dev));
 	    struct ata_device *atadev =
 		device_get_softc(rdp->disks[disk].dev);
+	    int len;
 
-	    bcopy(atadev->param.serial, meta->disk[disk].serial,
+	    for (len = 0; len < sizeof(atadev->param.serial); len++) {
+		if (atadev->param.serial[len] < 0x20)
+		    break;
+	    }
+	    len = (len > sizeof(rdp->disks[disk].serial)) ?
+	        len - sizeof(rdp->disks[disk].serial) : 0;
+	    bcopy(atadev->param.serial + len, meta->disk[disk].serial,
 		  sizeof(rdp->disks[disk].serial));
 	    meta->disk[disk].sectors = rdp->disks[disk].sectors;
 	    meta->disk[disk].id = (ch->unit << 16) | atadev->unit;