Needs btrfsctl, not btrfs module

modules.d/90btrfs/40-btrfs.rules

@@ -1,7 +1,7 @@
 SUBSYSTEM!="block", GOTO="btrfs_end"
 ACTION!="add|change", GOTO="btrfs_end"
 
-ENV{ID_FS_TYPE}=="btrfs", RUN+="/sbin/btrfs device scan $env{DEVNAME}"
+ENV{ID_FS_TYPE}=="btrfs", RUN+="/sbin/btrfsctl -A $env{DEVNAME}"
 
 LABEL="btrfs_end"
 

modules.d/90btrfs/check

@@ -3,8 +3,8 @@
 # We depend on udev-rules being loaded
 [ "$1" = "-d" ] && exit 0
 
-# if we don't have dmraid installed on the host system, no point
-# in trying to support it in the initramfs.
-which btrfs >/dev/null 2>&1 || exit 1
+# if we don't have btrfs (btrfsctl) installed on the host system,
+# no point in trying to support it in the initramfs.
+which btrfsctl >/dev/null 2>&1 || exit 1
 
 exit 0

modules.d/90btrfs/install

@@ -1,4 +1,4 @@
 #!/bin/bash
 
 inst_rules "$moddir/40-btrfs.rules"
-dracut_install btrfs
+dracut_install btrfsctl