diff --git a/libfstools/jffs2.c b/libfstools/jffs2.c
index 134e09d..1b8e1d9 100644
--- a/libfstools/jffs2.c
+++ b/libfstools/jffs2.c
@@ -52,21 +52,13 @@ foreachdir(const char *dir, int (*cb)(const char*))
 }
 
 static int
-jffs2_mount(void)
+jffs2_mount(struct volume *v)
 {
-	struct volume *v;
-
 	if (mkdir("/tmp/overlay", 0755)) {
 		fprintf(stderr, "failed to mkdir /tmp/overlay: %s\n", strerror(errno));
 		return -1;
 	}
 
-	v = volume_find("rootfs_data");
-	if (!v) {
-		fprintf(stderr, "rootfs_data does not exist\n");
-		return -1;
-	}
-
 	if (mount(v->blk, "/tmp/overlay", "jffs2", MS_NOATIME, NULL)) {
 		fprintf(stderr, "failed to mount -t jffs2 %s /tmp/overlay: %s\n", v->blk, strerror(errno));
 		return -1;
@@ -76,9 +68,8 @@ jffs2_mount(void)
 }
 
 static int
-switch2jffs(void)
+switch2jffs(struct volume *v)
 {
-	struct volume *v = volume_find("rootfs_data");
 	struct stat s;
 	int ret;
 
@@ -87,11 +78,6 @@ switch2jffs(void)
 		return -1;
 	}
 
-	if (!v) {
-		fprintf(stderr, "no rootfs_data was found\n");
-		return -1;
-	}
-
 	creat("/tmp/.switch_jffs2", 0600);
 	ret = mount(v->blk, "/rom/overlay", "jffs2", MS_NOATIME, NULL);
 	unlink("/tmp/.switch_jffs2");
@@ -157,9 +143,8 @@ handle_whiteout(const char *dir)
 }
 
 int
-jffs2_switch(int argc, char **argv)
+jffs2_switch(struct volume *v)
 {
-	struct volume *v;
 	char *mp;
 	int ret = -1;
 
@@ -171,7 +156,6 @@ jffs2_switch(int argc, char **argv)
 		return ret;
 	}
 
-	v = volume_find("rootfs_data");
 	mp = find_mount_point(v->blk, 0);
 	if (mp) {
 		fprintf(stderr, "rootfs_data:%s is already mounted as %s\n", v->blk, mp);
@@ -184,7 +168,7 @@ jffs2_switch(int argc, char **argv)
 		/* fall through */
 
 	case FS_DEADCODE:
-		ret = switch2jffs();
+		ret = switch2jffs(v);
 		if (!ret) {
 			fprintf(stderr, "doing fo cleanup\n");
 			umount2("/tmp/root", MNT_DETACH);
@@ -193,7 +177,7 @@ jffs2_switch(int argc, char **argv)
 		break;
 
 	case FS_JFFS2:
-		ret = jffs2_mount();
+		ret = jffs2_mount(v);
 		if (ret)
 			break;
 		if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
@@ -206,21 +190,13 @@ jffs2_switch(int argc, char **argv)
 	return ret;
 }
 
-static int mount_overlay_fs(void)
+static int mount_overlay_fs(struct volume *v)
 {
-	struct volume *v;
-
 	if (mkdir("/tmp/overlay", 0755)) {
 		fprintf(stderr, "failed to mkdir /tmp/overlay: %s\n", strerror(errno));
 		return -1;
 	}
 
-	v = volume_find("rootfs_data");
-	if (!v) {
-		fprintf(stderr, "rootfs_data does not exist\n");
-		return -1;
-	}
-
 	if (mount(v->blk, "/tmp/overlay", "jffs2", MS_NOATIME, NULL)) {
 		fprintf(stderr, "failed to mount -t jffs2 %s /tmp/overlay: %s\n",
 				v->blk, strerror(errno));
@@ -232,21 +208,17 @@ static int mount_overlay_fs(void)
 	return -1;
 }
 
-int mount_overlay(void)
+int mount_overlay(struct volume *v)
 {
-	struct volume *v = volume_find("rootfs_data");;
 	char *mp;
 
-	if (!v)
-		return -1;
-
 	mp = find_mount_point(v->blk, 0);
 	if (mp) {
 		fprintf(stderr, "rootfs_data:%s is already mounted as %s\n", v->blk, mp);
 		return -1;
 	}
 
-	mount_overlay_fs();
+	mount_overlay_fs(v);
 
 	extroot_prefix = "/tmp/overlay";
 	if (!mount_extroot()) {
diff --git a/libfstools/libfstools.h b/libfstools/libfstools.h
index 70220c2..df7e48b 100644
--- a/libfstools/libfstools.h
+++ b/libfstools/libfstools.h
@@ -17,6 +17,8 @@
 #include <libubox/list.h>
 #include <libubox/blob.h>
 
+struct volume;
+
 enum {
 	FS_NONE,
 	FS_SNAPSHOT,
@@ -27,8 +29,8 @@ enum {
 
 extern char const *extroot_prefix;
 extern int mount_extroot(void);
-extern int mount_snapshot(void);
-extern int mount_overlay(void);
+extern int mount_snapshot(struct volume *v);
+extern int mount_overlay(struct volume *v);
 
 extern int mount_move(char *oldroot, char *newroot, char *dir);
 extern int pivot(char *new, char *old);
@@ -43,7 +45,7 @@ extern int find_mtd_block(char *name, char *part, int plen);
 extern int find_mtd_char(char *name, char *part, int plen);
 
 extern int jffs2_ready(char *mtd);
-extern int jffs2_switch(int argc, char **argv);
+extern int jffs2_switch(struct volume *v);
 
 extern int handle_whiteout(const char *dir);
 extern void foreachdir(const char *dir, int (*cb)(const char*));
diff --git a/libfstools/overlay.c b/libfstools/overlay.c
index dc350b5..9e830a1 100644
--- a/libfstools/overlay.c
+++ b/libfstools/overlay.c
@@ -143,9 +143,8 @@ handle_whiteout(const char *dir)
 }
 
 int
-jffs2_switch(int argc, char **argv)
+jffs2_switch(struct volume *v)
 {
-	struct volume *v;
 	char *mp;
 	int ret = -1;
 
@@ -157,7 +156,6 @@ jffs2_switch(int argc, char **argv)
 		return ret;
 	}
 
-	v = volume_find("rootfs_data");
 	mp = find_mount_point(v->blk, 0);
 	if (mp) {
 		fprintf(stderr, "rootfs_data:%s is already mounted as %s\n", v->blk, mp);
@@ -201,9 +199,8 @@ jffs2_switch(int argc, char **argv)
 	return ret;
 }
 
-static int overlay_mount_fs(void)
+static int overlay_mount_fs(struct volume *v)
 {
-	struct volume *v;
 	char *fstype;
 
 	if (mkdir("/tmp/overlay", 0755)) {
@@ -211,12 +208,6 @@ static int overlay_mount_fs(void)
 		return -1;
 	}
 
-	v = volume_find("rootfs_data");
-	if (!v) {
-		fprintf(stderr, "rootfs_data does not exist\n");
-		return -1;
-	}
-
 	fstype = "jffs2";
 
 	switch (volume_identify(v)) {
@@ -236,9 +227,8 @@ static int overlay_mount_fs(void)
 	return -1;
 }
 
-int mount_overlay(void)
+int mount_overlay(struct volume *v)
 {
-	struct volume *v = volume_find("rootfs_data");;
 	char *mp;
 
 	if (!v)
@@ -250,7 +240,7 @@ int mount_overlay(void)
 		return -1;
 	}
 
-	overlay_mount_fs();
+	overlay_mount_fs(v);
 
 	extroot_prefix = "/tmp/overlay";
 	if (!mount_extroot()) {
diff --git a/libfstools/snapshot.c b/libfstools/snapshot.c
index 3289a9d..f2ee0cd 100644
--- a/libfstools/snapshot.c
+++ b/libfstools/snapshot.c
@@ -273,16 +273,12 @@ volatile_write(struct volume *v, uint32_t _seq)
 }
 
 static int
-snapshot_sync(void)
+snapshot_sync(struct volume *v)
 {
-	struct volume *v = volume_find("rootfs_data");
 	struct file_header sentinel, conf;
 	int next, block = 0;
 	uint32_t seq;
 
-	if (!v)
-		return -1;
-
 	next = snapshot_next_free(v, &seq);
 	block = config_find(v, &conf, &sentinel);
 	if (is_config(&conf) && conf.seq != seq) {
@@ -328,9 +324,9 @@ _ramoverlay(char *rom, char *overlay)
 }
 
 int
-mount_snapshot(void)
+mount_snapshot(struct volume *v)
 {
-	snapshot_sync();
+	snapshot_sync(v);
 	setenv("SNAPSHOT", "magic", 1);
 	_ramoverlay("/rom", "/overlay");
 	system("/sbin/snapshot unpack");
diff --git a/mount_root.c b/mount_root.c
index 1df4723..c1524a4 100644
--- a/mount_root.c
+++ b/mount_root.c
@@ -47,11 +47,11 @@ start(int argc, char *argv[1])
 
 	case FS_JFFS2:
 	case FS_UBIFS:
-		mount_overlay();
+		mount_overlay(v);
 		break;
 
 	case FS_SNAPSHOT:
-		mount_snapshot();
+		mount_snapshot(v);
 		break;
 	}
 
@@ -78,7 +78,7 @@ done(int argc, char *argv[1])
 	switch (volume_identify(v)) {
 	case FS_NONE:
 	case FS_DEADCODE:
-		return jffs2_switch(argc, argv);
+		return jffs2_switch(v);
 	}
 
 	return 0;
