Introduce the convenience function g_getattr() and make it DWIM.

Sponsored by: DARPA & NAI Labs.

2 files changed, 15 insertions, 0 deletions

diff --git a/sys/geom/geom.h b/sys/geom/geom.h
index 4c9b3f0..6dfe745 100644
--- a/sys/geom/geom.h
+++ b/sys/geom/geom.h
@@ -193,6 +193,8 @@ void g_destroy_geom(struct g_geom *pp);
 void g_destroy_provider(struct g_provider *pp);
 void g_dettach(struct g_consumer *cp);
 void g_error_provider(struct g_provider *pp, int error);
+int g_getattr__(const char *attr, struct g_consumer *cp, void *var, int len);
+#define g_getattr(a, c, v) g_getattr__((a), (c), (v), sizeof *(v))
 int g_haveattr(struct bio *bp, char *attribute, void *val, int len);
 int g_haveattr_int(struct bio *bp, char *attribute, int val);
 int g_haveattr_off_t(struct bio *bp, char *attribute, off_t val);
diff --git a/sys/geom/geom_subr.c b/sys/geom/geom_subr.c
index b9c6236..1bc2ced 100644
--- a/sys/geom/geom_subr.c
+++ b/sys/geom/geom_subr.c
@@ -640,3 +640,16 @@ g_insert_geom(char *class, struct g_consumer *cp)
 	return (gp);
 }
 
+int
+g_getattr__(const char *attr, struct g_consumer *cp, void *var, int len)
+{
+	int error, i;
+
+	i = len;
+	error = g_io_getattr(attr, cp, &i, var);
+	if (error)
+		return (error);
+	if (i != len)
+		return (EINVAL);
+	return (0);
+}