-) Correct sdcount for a plex when removing or adding subdisks.

-) Set correct sizes for plexes and volumes a subdisk has been removed.

Submitted by:   Ulf Lilleengen <lulf_AT_freebsd.org>

sys/geom/vinum/geom_vinum.h

@@ -91,5 +91,7 @@ int	gv_sd_to_drive(struct gv_softc *, struct gv_drive *, struct gv_sd *,
 int	gv_sd_to_plex(struct gv_plex *, struct gv_sd *, int);
 void	gv_update_plex_config(struct gv_plex *);
 void	gv_update_vol_size(struct gv_volume *, off_t);
+off_t	gv_vol_size(struct gv_volume *);
+off_t	gv_plex_size(struct gv_plex *);
 
 #endif /* !_GEOM_VINUM_H_ */

sys/geom/vinum/geom_vinum_rm.c

@@ -216,6 +216,7 @@ static int
 gv_rm_plex(struct gv_softc *sc, struct gctl_req *req, struct gv_plex *p, int flags)
 {
 	struct g_geom *gp;
+	struct gv_volume *v;
 	struct gv_sd *s, *s2;
 	int err;
 
@@ -245,7 +246,6 @@ gv_rm_plex(struct gv_softc *sc, struct gctl_req *req, struct gv_plex *p, int fla
 
 	/* Remove the subdisks our plex has. */
 	LIST_FOREACH_SAFE(s, &p->subdisks, in_plex, s2) {
-		p->sdcount--;
 #if 0
 		LIST_REMOVE(s, in_plex);
 		s->plex_sc = NULL;
@@ -256,12 +256,15 @@ gv_rm_plex(struct gv_softc *sc, struct gctl_req *req, struct gv_plex *p, int fla
 			return (err);
 	}
 
+	v = p->vol_sc;
 	/* Clean up and let our geom fade away. */
 	LIST_REMOVE(p, plex);
 	if (p->vol_sc != NULL) {
 		p->vol_sc->plexcount--;
 		LIST_REMOVE(p, in_volume);
 		p->vol_sc = NULL;
+		/* Correctly update the volume size. */
+		gv_update_vol_size(v, gv_vol_size(v));
 	}
 
 	gv_kill_plex_thread(p);
@@ -280,14 +283,28 @@ int
 gv_rm_sd(struct gv_softc *sc, struct gctl_req *req, struct gv_sd *s, int flags)
 {
 	struct g_provider *pp;
+	struct gv_plex *p;
+	struct gv_volume *v;
 
 	KASSERT(s != NULL, ("gv_rm_sd: NULL s"));
 
 	pp = s->provider;
+	p = s->plex_sc;
+	v = NULL;
 
 	/* Clean up. */
-	if (s->plex_sc)
+	if (p != NULL) {
 		LIST_REMOVE(s, in_plex);
+
+		p->sdcount--;
+		/* Update the plexsize. */
+		p->size = gv_plex_size(p);
+		v = p->vol_sc;
+		if (v != NULL) {
+			/* Update the size of our plex' volume. */
+			gv_update_vol_size(v, gv_vol_size(v));
+		}
+	}
 	if (s->drive_sc)
 		LIST_REMOVE(s, from_drive);
 	LIST_REMOVE(s, sd);

sys/geom/vinum/geom_vinum_subr.c

@@ -54,6 +54,8 @@ __FBSDID("$FreeBSD$");
 #include <geom/vinum/geom_vinum.h>
 #include <geom/vinum/geom_vinum_share.h>
 
+static off_t gv_plex_smallest_sd(struct gv_plex *, off_t);
+
 /* Find the VINUM class and it's associated geom. */
 struct g_geom *
 find_vinum_geom(void)
@@ -235,6 +237,20 @@ gv_format_config(struct gv_softc *sc, struct sbuf *sb, int ondisk, char *prefix)
 	return;
 }
 
+static off_t
+gv_plex_smallest_sd(struct gv_plex *p, off_t smallest)
+{
+	struct gv_sd *s;
+
+	KASSERT(p != NULL, ("gv_plex_smallest_sd: NULL p"));
+
+	LIST_FOREACH(s, &p->subdisks, in_plex) {
+		if (s->size < smallest)
+			smallest = s->size;
+	}
+	return (smallest);
+}
+
 int
 gv_sd_to_plex(struct gv_plex *p, struct gv_sd *s, int check)
 {
@@ -280,7 +296,7 @@ gv_sd_to_plex(struct gv_plex *p, struct gv_sd *s, int check)
 		break;
 
 	case GV_PLEX_RAID5:
-		p->size = (p->sdcount - 1) * s->size;
+		p->size = (p->sdcount - 1) * gv_plex_smallest_sd(p, s->size);
 		break;
 
 	default:
@@ -329,6 +345,60 @@ gv_update_vol_size(struct gv_volume *v, off_t size)
 	v->size = size;
 }
 
+/* Calculates the plex size. */
+off_t
+gv_plex_size(struct gv_plex *p)
+{
+	struct gv_sd *s;
+	off_t size;
+
+	KASSERT(p != NULL, ("gv_plex_size: NULL p"));
+
+	if (p->sdcount == 0)
+		return (0);
+
+	/* Adjust the size of our plex. */
+	size = 0;
+	switch (p->org) {
+	case GV_PLEX_CONCAT:
+		LIST_FOREACH(s, &p->subdisks, in_plex)
+			size += s->size;
+		break;
+	case GV_PLEX_STRIPED:
+		s = LIST_FIRST(&p->subdisks);
+		size = p->sdcount * s->size;
+		break;
+	case GV_PLEX_RAID5:
+		s = LIST_FIRST(&p->subdisks);
+		size = (p->sdcount - 1) * s->size;
+		break;
+	}
+
+	return (size);
+}
+
+/* Returns the size of a volume. */
+off_t
+gv_vol_size(struct gv_volume *v)
+{
+	struct gv_plex *p;
+	off_t minplexsize;
+
+	KASSERT(v != NULL, ("gv_vol_size: NULL v"));
+
+	p = LIST_FIRST(&v->plexes);
+	if (p == NULL)
+		return (0);
+
+	minplexsize = p->size;
+	LIST_FOREACH(p, &v->plexes, plex) {
+		if (p->size < minplexsize) {
+			minplexsize = p->size;
+		}
+	}
+	return (minplexsize);
+}
+
 void
 gv_update_plex_config(struct gv_plex *p)
 {
@@ -676,6 +746,7 @@ gv_free_sd(struct gv_sd *s)
 	}
 
 	d->avail += s->size;
+	d->sdcount--;
 }
 
 void