diff --git a/.topdeps b/.topdeps
index 607c231780..7f16cbcdd5 100644
--- a/.topdeps
+++ b/.topdeps
@@ -1,3 +1 @@
-gcc-branch
-fix-branch
-feature-branch
+zfs-branch
diff --git a/.topmsg b/.topmsg
index 03967cdff5..99071c09b0 100644
--- a/.topmsg
+++ b/.topmsg
@@ -1,19 +1,6 @@
 From: Brian Behlendorf <behlendorf1@llnl.gov>
-Subject: [PATCH] zfs branch
+Subject: [PATCH] linux have idmap
 
-Merged result of all changes which are relevant to both Solaris
-and Linux builds of the ZFS code.  These are changes where there
-is a reasonable chance they will be accepted upstream.
-
-Additionally, since this is effectively the root of the linux
-ZFS tree the core linux build system is added here.  This
-includes autogen.sh, configure.ac, m4 macros, some scripts/*,
-and makefiles for all the core ZFS components.  Linux-only
-features which require tweaks to the build system should appear
-on the relevant topic branches.  All autotools products which
-result from autogen.sh are commited to the linux-configure-branch.
-
-This branch also contains the META, ChangeLog, AUTHORS, TODO,
-and README, files.
+Use idmap service if available.
 
 Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
diff --git a/lib/libzfs/libzfs_dataset.c b/lib/libzfs/libzfs_dataset.c
index b9dc73ec98..23b4850462 100644
--- a/lib/libzfs/libzfs_dataset.c
+++ b/lib/libzfs/libzfs_dataset.c
@@ -45,7 +45,9 @@
 #include <grp.h>
 #include <stddef.h>
 #include <ucred.h>
+#ifdef HAVE_IDMAP
 #include <idmap.h>
+#endif /* HAVE_IDMAP */
 #include <aclutils.h>
 
 #include <sys/spa.h>
@@ -1996,6 +1998,7 @@ zfs_prop_get_numeric(zfs_handle_t *zhp, zfs_prop_t prop, uint64_t *value,
 	return (0);
 }
 
+#ifdef HAVE_IDMAP
 static int
 idmap_id_to_numeric_domain_rid(uid_t id, boolean_t isuser,
     char **domainp, idmap_rid_t *ridp)
@@ -2030,6 +2033,7 @@ out:
 		(void) idmap_fini(idmap_hdl);
 	return (err);
 }
+#endif /* HAVE_IDMAP */
 
 /*
  * convert the propname into parameters needed by kernel
@@ -2062,6 +2066,7 @@ userquota_propname_decode(const char *propname, boolean_t zoned,
 	cp = strchr(propname, '@') + 1;
 
 	if (strchr(cp, '@')) {
+#ifdef HAVE_IDMAP
 		/*
 		 * It's a SID name (eg "user@domain") that needs to be
 		 * turned into S-1-domainID-RID.  There should be a
@@ -2082,6 +2087,9 @@ userquota_propname_decode(const char *propname, boolean_t zoned,
 			return (ENOENT);
 		(void) strlcpy(domain, mapdomain, domainlen);
 		*ridp = rid;
+#else
+		return (ENOSYS);
+#endif /* HAVE_IDMAP */
 	} else if (strncmp(cp, "S-1-", 4) == 0) {
 		/* It's a numeric SID (eg "S-1-234-567-89") */
 		(void) strcpy(domain, cp);
@@ -2114,6 +2122,7 @@ userquota_propname_decode(const char *propname, boolean_t zoned,
 			*ridp = gr->gr_gid;
 		}
 	} else {
+#ifdef HAVE_IDMAP
 		/* It's a user/group ID (eg "12345"). */
 		uid_t id = strtoul(cp, &end, 10);
 		idmap_rid_t rid;
@@ -2131,6 +2140,9 @@ userquota_propname_decode(const char *propname, boolean_t zoned,
 		} else {
 			*ridp = id;
 		}
+#else
+		return (ENOSYS);
+#endif /* HAVE_IDMAP */
 	}
 
 	return (0);