add initrd-fs.target and initrd-fs-pre.target

Makefile.am

@@ -343,6 +343,8 @@ dist_systemunit_DATA = \
 	units/kexec.target \
 	units/local-fs.target \
 	units/local-fs-pre.target \
+	units/initrd-fs.target \
+	units/initrd-fs-pre.target \
 	units/remote-fs.target \
 	units/remote-fs-pre.target \
 	units/network.target \

src/core/special.h

@@ -48,6 +48,8 @@
 #define SPECIAL_SOCKETS_TARGET "sockets.target"
 #define SPECIAL_LOCAL_FS_TARGET "local-fs.target"
 #define SPECIAL_LOCAL_FS_PRE_TARGET "local-fs-pre.target"
+#define SPECIAL_INITRD_FS_TARGET "initrd-fs.target"
+#define SPECIAL_INITRD_FS_PRE_TARGET "initrd-fs-pre.target"
 #define SPECIAL_REMOTE_FS_TARGET "remote-fs.target"       /* LSB's $remote_fs */
 #define SPECIAL_REMOTE_FS_PRE_TARGET "remote-fs-pre.target"
 #define SPECIAL_SWAP_TARGET "swap.target"

units/initrd-fs-pre.target

@@ -0,0 +1,11 @@
+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+
+[Unit]
+Description=Initrd File Systems (Pre)
+Documentation=man:systemd.special(7)
+ConditionPathExists=/etc/initrd-release

units/initrd-fs.target

@@ -0,0 +1,13 @@
+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+
+[Unit]
+Description=Initrd File Systems
+Documentation=man:systemd.special(7)
+OnFailure=emergency.target
+OnFailureIsolate=yes
+ConditionPathExists=/etc/initrd-release