util-linux: add fstrim support

This PR adds optional fstrim support

Signed-off-by: Dirk Brenken <dev@brenken.org>

package/utils/util-linux/Makefile

@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2007-2015 OpenWrt.org
+# Copyright (C) 2007-2018 OpenWrt.org
 #
 # This is free software, licensed under the GNU General Public License v2.
 # See /LICENSE for more information.
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=util-linux
 PKG_VERSION:=2.30.2
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=@KERNEL/linux/utils/$(PKG_NAME)/v2.30
@@ -205,6 +205,19 @@ define Package/flock/description
   manages flock locks from within shell scripts or the command line
 endef
 
+define Package/fstrim
+$(call Package/util-linux/Default)
+  TITLE:=discard unused blocks on a mounted filesystem
+  DEPENDS:= +libblkid +libuuid +libsmartcols +libmount
+  SUBMENU=Filesystem
+endef
+
+define Package/fstrim/description
+  fstrim is used on a mounted filesystem to discard (or "trim") blocks
+  which are not in use by the filesystem.  This is useful for solid-
+  state drives (SSDs) and thinly-provisioned storage.
+endef
+
 define Package/getopt
 $(call Package/util-linux/Default)
   TITLE:=parse command options (enhanced)
@@ -553,6 +566,11 @@ define Package/flock/install
 	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/bin/flock $(1)/usr/bin/
 endef
 
+define Package/fstrim/install
+	$(INSTALL_DIR) $(1)/usr/sbin
+	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/sbin/fstrim $(1)/usr/sbin/
+endef
+
 define Package/getopt/install
 	$(INSTALL_DIR) $(1)/usr/bin
 	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/bin/getopt $(1)/usr/bin/
@@ -678,6 +696,7 @@ $(eval $(call BuildPackage,dmesg))
 $(eval $(call BuildPackage,fdisk))
 $(eval $(call BuildPackage,findfs))
 $(eval $(call BuildPackage,flock))
+$(eval $(call BuildPackage,fstrim))
 $(eval $(call BuildPackage,getopt))
 $(eval $(call BuildPackage,hwclock))
 $(eval $(call BuildPackage,logger))