From b9655c9adb908d7d26aae414f1d9186c1bae160e Mon Sep 17 00:00:00 2001
From: trasz <trasz@FreeBSD.org>
Date: Sat, 7 Jul 2012 22:22:13 +0000
Subject: Add trivial resize handling to gnop(8).

Reviewed by:	mav
Sponsored by:	FreeBSD Foundation
---
 sys/geom/nop/g_nop.c | 28 ++++++++++++++++++++++++++++
 sys/geom/nop/g_nop.h |  1 +
 2 files changed, 29 insertions(+)

(limited to 'sys')

diff --git a/sys/geom/nop/g_nop.c b/sys/geom/nop/g_nop.c
index c28a77f..c43fb2d 100644
--- a/sys/geom/nop/g_nop.c
+++ b/sys/geom/nop/g_nop.c
@@ -72,6 +72,30 @@ g_nop_orphan(struct g_consumer *cp)
 }
 
 static void
+g_nop_resize(struct g_consumer *cp)
+{
+	struct g_nop_softc *sc;
+	struct g_geom *gp;
+	struct g_provider *pp;
+	off_t size;
+
+	g_topology_assert();
+
+	gp = cp->geom;
+	sc = gp->softc;
+
+	if (sc->sc_explicitsize != 0)
+		return;
+	if (cp->provider->mediasize < sc->sc_offset) {
+		g_nop_destroy(gp, 1);
+		return;
+	}
+	size = cp->provider->mediasize - sc->sc_offset;
+	LIST_FOREACH(pp, &gp->provider, provider)
+		g_resize_provider(pp, size);
+}
+
+static void
 g_nop_start(struct bio *bp)
 {
 	struct g_nop_softc *sc;
@@ -146,6 +170,7 @@ g_nop_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp,
 	struct g_consumer *cp;
 	char name[64];
 	int error;
+	off_t explicitsize;
 
 	g_topology_assert();
 
@@ -165,6 +190,7 @@ g_nop_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp,
 		gctl_error(req, "Invalid offset for provider %s.", pp->name);
 		return (EINVAL);
 	}
+	explicitsize = size;
 	if (size == 0)
 		size = pp->mediasize - offset;
 	if (offset + size > pp->mediasize) {
@@ -192,6 +218,7 @@ g_nop_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp,
 	gp = g_new_geomf(mp, name);
 	sc = g_malloc(sizeof(*sc), M_WAITOK);
 	sc->sc_offset = offset;
+	sc->sc_explicitsize = explicitsize;
 	sc->sc_error = ioerror;
 	sc->sc_rfailprob = rfailprob;
 	sc->sc_wfailprob = wfailprob;
@@ -202,6 +229,7 @@ g_nop_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp,
 	gp->softc = sc;
 	gp->start = g_nop_start;
 	gp->orphan = g_nop_orphan;
+	gp->resize = g_nop_resize;
 	gp->access = g_nop_access;
 	gp->dumpconf = g_nop_dumpconf;
 
diff --git a/sys/geom/nop/g_nop.h b/sys/geom/nop/g_nop.h
index fa66f59..4bfc4e1 100644
--- a/sys/geom/nop/g_nop.h
+++ b/sys/geom/nop/g_nop.h
@@ -57,6 +57,7 @@
 struct g_nop_softc {
 	int		sc_error;
 	off_t		sc_offset;
+	off_t		sc_explicitsize;
 	u_int		sc_rfailprob;
 	u_int		sc_wfailprob;
 	uintmax_t	sc_reads;
-- 
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