svn commit: r245851 - stable/9/sys/geom

[Scott Long]

Author: scottl
Date: Wed Jan 23 22:56:03 2013
New Revision: 245851
URL: http://svnweb.freebsd.org/changeset/base/245851

Log:
  MFC r239132:
  
  Clone BIO_ORDERED flag, for disk drivers (namely CAM) that try to
   consume it.

Modified:
  stable/9/sys/geom/geom_io.c
Directory Properties:
  stable/9/sys/   (props changed)

Modified: stable/9/sys/geom/geom_io.c
==============================================================================
--- stable/9/sys/geom/geom_io.c	Wed Jan 23 22:52:20 2013	(r245850)
+++ stable/9/sys/geom/geom_io.c	Wed Jan 23 22:56:03 2013	(r245851)
@@ -177,6 +177,12 @@ g_clone_bio(struct bio *bp)
 	if (bp2 != NULL) {
 		bp2->bio_parent = bp;
 		bp2->bio_cmd = bp->bio_cmd;
+		/*
+		 *  BIO_ORDERED flag may be used by disk drivers to enforce
+		 *  ordering restrictions, so this flag needs to be cloned.
+		 *  Other bio flags are not suitable for cloning.
+		 */
+		bp2->bio_flags = bp->bio_flags & BIO_ORDERED;
 		bp2->bio_length = bp->bio_length;
 		bp2->bio_offset = bp->bio_offset;
 		bp2->bio_data = bp->bio_data;