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From: Alexander Motin <mav@FreeBSD.org>
Date: Tue, 26 Mar 2013 07:55:25 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r248722 - head/sys/geom
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Author: mav
Date: Tue Mar 26 07:55:24 2013
New Revision: 248722
URL: http://svnweb.freebsd.org/changeset/base/248722

Log:
  geom_slice.c and its consumers like GEOM_LABEL are not touching the data
  unless hotspots are used.  Pass G_PF_ACCEPT_UNMAPPED flag through except
  such rare cases (obsolete GEOM_SUNLABEL and GEOM_BSD).

Modified:
  head/sys/geom/geom_slice.c

Modified: head/sys/geom/geom_slice.c
==============================================================================
--- head/sys/geom/geom_slice.c	Tue Mar 26 05:58:49 2013	(r248721)
+++ head/sys/geom/geom_slice.c	Tue Mar 26 07:55:24 2013	(r248722)
@@ -396,6 +396,8 @@ g_slice_config(struct g_geom *gp, u_int 
 	pp->stripeoffset = pp2->stripeoffset + offset;
 	if (pp->stripesize > 0)
 		pp->stripeoffset %= pp->stripesize;
+	if (gsp->nhotspot == 0)
+		pp->flags |= pp2->flags & G_PF_ACCEPT_UNMAPPED;
 	if (0 && bootverbose)
 		printf("GEOM: Configure %s, start %jd length %jd end %jd\n",
 		    pp->name, (intmax_t)offset, (intmax_t)length,
@@ -428,11 +430,17 @@ g_slice_conf_hot(struct g_geom *gp, u_in
 {
 	struct g_slicer *gsp;
 	struct g_slice_hot *gsl, *gsl2;
+	struct g_provider *pp;
 
 	g_trace(G_T_TOPOLOGY, "g_slice_conf_hot(%s, idx: %d, off: %jd, len: %jd)",
 	    gp->name, idx, (intmax_t)offset, (intmax_t)length);
 	g_topology_assert();
 	gsp = gp->softc;
+	/* Deny unmapped I/O if hotspots are used. */
+	if (gsp->nhotspot == 0) {
+		LIST_FOREACH(pp, &gp->provider, provider)
+			pp->flags &= ~G_PF_ACCEPT_UNMAPPED;
+	}
 	gsl = gsp->hotspot;
 	if(idx >= gsp->nhotspot) {
 		gsl2 = g_malloc((idx + 1) * sizeof *gsl2, M_WAITOK | M_ZERO);