Author: jimharris
Date: Tue Aug 7 20:16:10 2012
New Revision: 239132
URL: http://svn.freebsd.org/changeset/base/239132
Log:
Clone BIO_ORDERED flag, for disk drivers (namely CAM) that try to
consume it.
Sponsored by: Intel
Discussed with: gibbs, scottl
Modified:
head/sys/geom/geom_io.c
Modified: head/sys/geom/geom_io.c
==============================================================================
--- head/sys/geom/geom_io.c Tue Aug 7 18:50:33 2012 (r239131)
+++ head/sys/geom/geom_io.c Tue Aug 7 20:16:10 2012 (r239132)
@@ -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;
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