Implement ZFS Support

This provides ZFS support, to go with the sys-fs/zfs package.

Signed-off-by: Robin H. Johnson <robbat2@gentoo.org> (cleanups)

23 files changed, 141 insertions, 19 deletions

diff --git a/ChangeLog b/ChangeLog
index 6c2a7d7a..d6e4dcf2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -5,6 +5,16 @@
 # Distributed under the GPL v2
 # $Id$
 
+  06 Feb 2012: Richard Yao <ryao@cs.stonybrook.edu> arch/alpha/modules_load,
+  arch/arm/modules_load, arch/ia64/modules_load, arch/mips/modules_load,
+  arch/parisc/modules_load, arch/parisc64/modules_load, arch/ppc/modules_load,
+  arch/ppc64/modules_load, arch/sparc/modules_load, arch/sparc64/modules_load,
+  arch/um/modules_load, arch/x86/modules_load, arch/x86_64/modules_load,
+  defaults/busy-config, defaults/initrd.scripts, defaults/linuxrc,
+  defaults/modules_load, doc/genkernel.8.txt, gen_cmdline.sh,
+  gen_determineargs.sh, gen_initramfs.sh, genkernel:
+  This provides ZFS support, to go with the sys-fs/zfs package.
+
   06 Feb 2012; Robin H. Johnson <robbat2@gentoo.org> gen_initramfs.sh:
   Refactor copy_binaries and multipath slightly for ease of usage and readability.
 
diff --git a/arch/alpha/modules_load b/arch/alpha/modules_load
index 2aeb5c1d..6d7dfbf8 100644
--- a/arch/alpha/modules_load
+++ b/arch/alpha/modules_load
@@ -24,5 +24,5 @@ MODULES_PCMCIA="pcmcia pcmcia_core yenta_socket pd6729 i82092 i82365 tcic ds ide
 MODULES_USB="ehci-hcd uhci usb-ohci hid usb-storage uhci-hcd ohci-hcd usbhid sl811-hcd hid-a4tech hid-apple hid-belkin hid-cherry hid-chicony hid-cypress hid-dummy hid-ezkey hid-gyration hid-logitech hid-microsoft hid-monterey hid-petalynx hid-pl hid-samsung hid-sony hid-sunplus"
 
 # Filesystems
-MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs fuse"
+MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs zfs fuse"
 
diff --git a/arch/arm/modules_load b/arch/arm/modules_load
index a4c5f51f..616caaf5 100644
--- a/arch/arm/modules_load
+++ b/arch/arm/modules_load
@@ -21,5 +21,5 @@ MODULES_PCMCIA="pcmcia pcmcia_core yenta_socket pd6729 i82092 i82365 tcic ds ide
 MODULES_USB="ehci-hcd uhci usb-ohci hid usb-storage uhci-hcd ohci-hcd usbhid sl811-hcd hid-a4tech hid-apple hid-belkin hid-cherry hid-chicony hid-cypress hid-dummy hid-ezkey hid-gyration hid-logitech hid-microsoft hid-monterey hid-petalynx hid-pl hid-samsung hid-sony hid-sunplus"
 
 # Filesystems
-MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs fuse"
+MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs zfs fuse"
 
diff --git a/arch/ia64/modules_load b/arch/ia64/modules_load
index 971484c4..aa9ae313 100644
--- a/arch/ia64/modules_load
+++ b/arch/ia64/modules_load
@@ -24,4 +24,4 @@ MODULES_PCMCIA="pcmcia pcmcia_core yenta_socket pd6729 i82092 i82365 tcic ds ide
 MODULES_USB="ehci-hcd uhci usb-ohci hid usb-storage uhci-hcd ohci-hcd usbhid sl811-hcd hid-a4tech hid-apple hid-belkin hid-cherry hid-chicony hid-cypress hid-dummy hid-ezkey hid-gyration hid-logitech hid-microsoft hid-monterey hid-petalynx hid-pl hid-samsung hid-sony hid-sunplus"
 
 # Filesystems
-MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs fuse"
+MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs zfs fuse"
diff --git a/arch/mips/modules_load b/arch/mips/modules_load
index 2aeb5c1d..6d7dfbf8 100644
--- a/arch/mips/modules_load
+++ b/arch/mips/modules_load
@@ -24,5 +24,5 @@ MODULES_PCMCIA="pcmcia pcmcia_core yenta_socket pd6729 i82092 i82365 tcic ds ide
 MODULES_USB="ehci-hcd uhci usb-ohci hid usb-storage uhci-hcd ohci-hcd usbhid sl811-hcd hid-a4tech hid-apple hid-belkin hid-cherry hid-chicony hid-cypress hid-dummy hid-ezkey hid-gyration hid-logitech hid-microsoft hid-monterey hid-petalynx hid-pl hid-samsung hid-sony hid-sunplus"
 
 # Filesystems
-MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs fuse"
+MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs zfs fuse"
 
diff --git a/arch/parisc/modules_load b/arch/parisc/modules_load
index 2aeb5c1d..6d7dfbf8 100644
--- a/arch/parisc/modules_load
+++ b/arch/parisc/modules_load
@@ -24,5 +24,5 @@ MODULES_PCMCIA="pcmcia pcmcia_core yenta_socket pd6729 i82092 i82365 tcic ds ide
 MODULES_USB="ehci-hcd uhci usb-ohci hid usb-storage uhci-hcd ohci-hcd usbhid sl811-hcd hid-a4tech hid-apple hid-belkin hid-cherry hid-chicony hid-cypress hid-dummy hid-ezkey hid-gyration hid-logitech hid-microsoft hid-monterey hid-petalynx hid-pl hid-samsung hid-sony hid-sunplus"
 
 # Filesystems
-MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs fuse"
+MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs zfs fuse"
 
diff --git a/arch/parisc64/modules_load b/arch/parisc64/modules_load
index 971484c4..aa9ae313 100644
--- a/arch/parisc64/modules_load
+++ b/arch/parisc64/modules_load
@@ -24,4 +24,4 @@ MODULES_PCMCIA="pcmcia pcmcia_core yenta_socket pd6729 i82092 i82365 tcic ds ide
 MODULES_USB="ehci-hcd uhci usb-ohci hid usb-storage uhci-hcd ohci-hcd usbhid sl811-hcd hid-a4tech hid-apple hid-belkin hid-cherry hid-chicony hid-cypress hid-dummy hid-ezkey hid-gyration hid-logitech hid-microsoft hid-monterey hid-petalynx hid-pl hid-samsung hid-sony hid-sunplus"
 
 # Filesystems
-MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs fuse"
+MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs zfs fuse"
diff --git a/arch/ppc/modules_load b/arch/ppc/modules_load
index 2aeb5c1d..6d7dfbf8 100644
--- a/arch/ppc/modules_load
+++ b/arch/ppc/modules_load
@@ -24,5 +24,5 @@ MODULES_PCMCIA="pcmcia pcmcia_core yenta_socket pd6729 i82092 i82365 tcic ds ide
 MODULES_USB="ehci-hcd uhci usb-ohci hid usb-storage uhci-hcd ohci-hcd usbhid sl811-hcd hid-a4tech hid-apple hid-belkin hid-cherry hid-chicony hid-cypress hid-dummy hid-ezkey hid-gyration hid-logitech hid-microsoft hid-monterey hid-petalynx hid-pl hid-samsung hid-sony hid-sunplus"
 
 # Filesystems
-MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs fuse"
+MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs zfs fuse"
 
diff --git a/arch/ppc64/modules_load b/arch/ppc64/modules_load
index 971484c4..aa9ae313 100644
--- a/arch/ppc64/modules_load
+++ b/arch/ppc64/modules_load
@@ -24,4 +24,4 @@ MODULES_PCMCIA="pcmcia pcmcia_core yenta_socket pd6729 i82092 i82365 tcic ds ide
 MODULES_USB="ehci-hcd uhci usb-ohci hid usb-storage uhci-hcd ohci-hcd usbhid sl811-hcd hid-a4tech hid-apple hid-belkin hid-cherry hid-chicony hid-cypress hid-dummy hid-ezkey hid-gyration hid-logitech hid-microsoft hid-monterey hid-petalynx hid-pl hid-samsung hid-sony hid-sunplus"
 
 # Filesystems
-MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs fuse"
+MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs zfs fuse"
diff --git a/arch/sparc/modules_load b/arch/sparc/modules_load
index 2aeb5c1d..6d7dfbf8 100644
--- a/arch/sparc/modules_load
+++ b/arch/sparc/modules_load
@@ -24,5 +24,5 @@ MODULES_PCMCIA="pcmcia pcmcia_core yenta_socket pd6729 i82092 i82365 tcic ds ide
 MODULES_USB="ehci-hcd uhci usb-ohci hid usb-storage uhci-hcd ohci-hcd usbhid sl811-hcd hid-a4tech hid-apple hid-belkin hid-cherry hid-chicony hid-cypress hid-dummy hid-ezkey hid-gyration hid-logitech hid-microsoft hid-monterey hid-petalynx hid-pl hid-samsung hid-sony hid-sunplus"
 
 # Filesystems
-MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs fuse"
+MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs zfs fuse"
 
diff --git a/arch/sparc64/modules_load b/arch/sparc64/modules_load
index 971484c4..aa9ae313 100644
--- a/arch/sparc64/modules_load
+++ b/arch/sparc64/modules_load
@@ -24,4 +24,4 @@ MODULES_PCMCIA="pcmcia pcmcia_core yenta_socket pd6729 i82092 i82365 tcic ds ide
 MODULES_USB="ehci-hcd uhci usb-ohci hid usb-storage uhci-hcd ohci-hcd usbhid sl811-hcd hid-a4tech hid-apple hid-belkin hid-cherry hid-chicony hid-cypress hid-dummy hid-ezkey hid-gyration hid-logitech hid-microsoft hid-monterey hid-petalynx hid-pl hid-samsung hid-sony hid-sunplus"
 
 # Filesystems
-MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs fuse"
+MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs zfs fuse"
diff --git a/arch/um/modules_load b/arch/um/modules_load
index cf3b19f5..d00e495e 100644
--- a/arch/um/modules_load
+++ b/arch/um/modules_load
@@ -24,5 +24,5 @@ MODULES_PCMCIA="pcmcia pcmcia_core yenta_socket pd6729 i82092 i82365 tcic ds ide
 MODULES_USB="ehci-hcd uhci usb-ohci hid usb-storage uhci-hcd ohci-hcd usbhid sl811-hcd hid-a4tech hid-apple hid-belkin hid-cherry hid-chicony hid-cypress hid-dummy hid-ezkey hid-gyration hid-logitech hid-microsoft hid-monterey hid-petalynx hid-pl hid-samsung hid-sony hid-sunplus"
 
 # Filesystems
-MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs fuse"
+MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs zfs fuse"
 
diff --git a/arch/x86/modules_load b/arch/x86/modules_load
index a9383e55..c6019272 100644
--- a/arch/x86/modules_load
+++ b/arch/x86/modules_load
@@ -25,5 +25,5 @@ MODULES_PCMCIA="pcmcia pcmcia_core yenta_socket pd6729 i82092 i82365 tcic ds ide
 MODULES_USB="ehci-hcd uhci usb-ohci hid usb-storage uhci-hcd ohci-hcd usbhid sl811-hcd hid-a4tech hid-apple hid-belkin hid-cherry hid-chicony hid-cypress hid-dummy hid-ezkey hid-gyration hid-logitech hid-microsoft hid-monterey hid-petalynx hid-pl hid-samsung hid-sony hid-sunplus"
 
 # Filesystems
-MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs fuse"
+MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs zfs fuse"
 
diff --git a/arch/x86_64/modules_load b/arch/x86_64/modules_load
index d12f57d8..0da1ec39 100644
--- a/arch/x86_64/modules_load
+++ b/arch/x86_64/modules_load
@@ -24,4 +24,4 @@ MODULES_PCMCIA="pcmcia pcmcia_core yenta_socket pd6729 i82092 i82365 tcic ds ide
 MODULES_USB="ehci-hcd uhci usb-ohci hid usb-storage uhci-hcd ohci-hcd usbhid sl811-hcd hid-a4tech hid-apple hid-belkin hid-cherry hid-chicony hid-cypress hid-dummy hid-ezkey hid-gyration hid-logitech hid-microsoft hid-monterey hid-petalynx hid-pl hid-samsung hid-sony hid-sunplus"
 
 # Filesystems
-MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs fuse"
+MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs zfs fuse"
diff --git a/defaults/busy-config b/defaults/busy-config
index 8d693693..2b9a4c45 100644
--- a/defaults/busy-config
+++ b/defaults/busy-config
@@ -220,7 +220,7 @@ CONFIG_FALSE=y
 CONFIG_FSYNC=y
 CONFIG_HEAD=y
 # CONFIG_FEATURE_FANCY_HEAD is not set
-# CONFIG_HOSTID is not set
+CONFIG_HOSTID=y
 # CONFIG_INSTALL is not set
 # CONFIG_FEATURE_INSTALL_LONG_OPTIONS is not set
 CONFIG_LN=y
diff --git a/defaults/initrd.scripts b/defaults/initrd.scripts
index 609c52f7..54e7b807 100755
--- a/defaults/initrd.scripts
+++ b/defaults/initrd.scripts
@@ -664,6 +664,11 @@ startVolumes() {
 			bad_msg "vgscan or vgchange not found: skipping LVM volume group activation!"
 		fi
 	fi
+	
+	if [ "${USE_ZFS}" = '1' ]
+	then
+		/sbin/zpool import -N -a ${ZPOOL_FORCE}
+	fi
 }
 
 startiscsi() {
diff --git a/defaults/linuxrc b/defaults/linuxrc
index 6bdaea1b..0a69a6d8 100755
--- a/defaults/linuxrc
+++ b/defaults/linuxrc
@@ -96,6 +96,19 @@ do
 			DMRAID_OPTS=${x#*=}
 			USE_DMRAID_NORMAL=1
 		;;
+		dozfs*)
+			if [ ! -x /sbin/zfs ]; then
+				USE_ZFS=0
+				bad_msg 'zfs binary not found: aborting use of zfs!'
+			else
+				USE_ZFS=1
+				MY_HWOPTS="${MY_HWOPTS} zfs"
+				if [ "${x#*=}" = 'force' ]
+				then
+					ZPOOL_FORCE=-f
+				fi
+			fi
+		;;
 		# Debug Options
 		debug)
 			DEBUG='yes'
@@ -444,6 +457,49 @@ do
 					continue
 				fi
 				;;
+			ZFS*)
+				ROOT_DEV="${REAL_ROOT#*=}"
+				if [ "${ROOT_DEV}" != 'ZFS' ] 
+				then
+					zfs get type ${ROOT_DEV} > /dev/null
+
+					if [ "$?" = '0' ]
+					then
+						got_good_root=1;
+						REAL_ROOT=${ROOT_DEV}
+						ROOTFSTYPE=zfs
+					fi
+				else
+					BOOTFS=$(/sbin/zpool list -H -o bootfs)
+					if [ "${BOOTFS}" != '-' ]
+					then
+
+						for i in ${BOOTFS}
+						do
+
+							zfs get type ${i} > /dev/null
+							retval=$?
+
+							if [ ${retval} -eq 0 ];	then
+								got_good_root=1
+								REAL_ROOT=${i}
+								ROOTFSTYPE=zfs
+								break
+							fi	
+						
+						done;
+
+					fi
+
+				fi
+
+				if [ ${got_good_root} -ne 1 ]; then
+					prompt_user "REAL_ROOT" "root block device"
+					got_good_root=0
+				fi
+					
+				continue
+				;;
 		esac
 
 		if [ "${REAL_ROOT}" = '' ]
@@ -477,17 +533,24 @@ do
 	else
 		good_msg "Mounting root..."
 
+		if [ "${ROOTFSTYPE}" = 'zfs' ]
+		then
+			MOUNT_STATE=rw
+		else
+			MOUNT_STATE=ro
+		fi
+
 		# Try to mount the device as ${NEW_ROOT}
 		if [ "${REAL_ROOT}" = '/dev/nfs' ]; then
 			findnfsmount
 		else
 			# mount ro so fsck doesn't barf later
 			if [ "${REAL_ROOTFLAGS}" = '' ]; then
-				good_msg "Using mount -t ${ROOTFSTYPE} -o ro"
-				mount -t ${ROOTFSTYPE} -o ro ${REAL_ROOT} ${NEW_ROOT}
+				good_msg "Using mount -t ${ROOTFSTYPE} -o ${MOUNT_STATE}"
+				mount -t ${ROOTFSTYPE} -o ${MOUNT_STATE} ${REAL_ROOT} ${NEW_ROOT}
 			else
-				good_msg "Using mount -t ${ROOTFSTYPE} -o ro,${REAL_ROOTFLAGS}"
-				mount -t ${ROOTFSTYPE} -o ro,${REAL_ROOTFLAGS} ${REAL_ROOT} ${NEW_ROOT}
+				good_msg "Using mount -t ${ROOTFSTYPE} -o ${MOUNT_STATE},${REAL_ROOTFLAGS}"
+				mount -t ${ROOTFSTYPE} -o ${MOUNT_STATE},${REAL_ROOTFLAGS} ${REAL_ROOT} ${NEW_ROOT}
 			fi
 		fi
 
diff --git a/defaults/modules_load b/defaults/modules_load
index 269a40c7..d65f9f93 100644
--- a/defaults/modules_load
+++ b/defaults/modules_load
@@ -24,5 +24,5 @@ MODULES_PCMCIA="pcmcia pcmcia_core yenta_socket pd6729 i82092 i82365 tcic ds ide
 MODULES_USB="ehci-hcd uhci usb-ohci hid usb-storage uhci-hcd ohci-hcd usbhid sl811-hcd"
 
 # Filesystems
-MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs fuse"
+MODULES_FS="ext2 ext3 ext4 btrfs reiserfs jfs nfs xfs zfs fuse"
 
diff --git a/doc/genkernel.8.txt b/doc/genkernel.8.txt
index 1e02fb7d..67edbd94 100644
--- a/doc/genkernel.8.txt
+++ b/doc/genkernel.8.txt
@@ -260,6 +260,9 @@ INITIALIZATION
 *--*[*no-*]*dmraid*::
     Includes or excludes DMRAID support.
 
+*--*[*no-*]*zfs*::
+    Includes or excludes ZFS support.
+
 *--*[*no-*]*multipath*::
     Includes or excludes Multipath support
 
@@ -439,6 +442,10 @@ which the ramdisk scripts would recognize.
 *domdadm*::
     Scan for RAID arrays on bootup
 
+*dozfs*[=force]::
+    Scan for bootable ZFS pools on bootup. Optionally force import if
+    necessary.
+
 *doscsi*::
     Activate SCSI devices on bootup, necessary when SCSI support is
     compiled as modules and you're using SCSI or SATA devices.
@@ -586,6 +593,7 @@ AUTHORS
 - NFS Support by Thomas Seiler <thseiler@gmail.com>
 - GnuPG 1.x integration by dacook <schism@subverted.org>
 - MDADM integration by Matthias Dahl <ua_bugz_gentoo@mortal-soul.de>
+- ZFS integration by Richard Yao <ryao@cs.stonybrook.edu>
 
 
 SEE ALSO
diff --git a/gen_cmdline.sh b/gen_cmdline.sh
index 4c04f940..de56a253 100755
--- a/gen_cmdline.sh
+++ b/gen_cmdline.sh
@@ -90,6 +90,8 @@ longusage() {
   echo "	--mdadm-config=<file>	Use file as mdadm.conf in initramfs"
   echo "	--dmraid		Include DMRAID support"
   echo "	--no-dmraid		Exclude DMRAID support"
+  echo "	--zfs			Include ZFS support"
+  echo "	--no-zfs		Exclude ZFS support"
   echo "	--multipath		Include Multipath support"
   echo "	--no-multipath	Exclude Multipath support"
   echo "	--iscsi			Include iSCSI support"
@@ -296,6 +298,10 @@ parse_cmdline() {
 			fi
 			print_info 2 "CMD_DMRAID: ${CMD_DMRAID}"
 			;;
+		--zfs|--no-zfs)
+			CMD_ZFS=`parse_optbool "$*"`
+			print_info 2 "CMD_ZFS: ${CMD_ZFS}"
+			;;
 		--multipath|--no-multipath)
 			CMD_MULTIPATH=`parse_optbool "$*"`
 			if [ "$CMD_MULTIPATH" = "1" -a ! -e /usr/include/libdevmapper.h ]
diff --git a/gen_determineargs.sh b/gen_determineargs.sh
index b12efcaf..e6ed0a3c 100755
--- a/gen_determineargs.sh
+++ b/gen_determineargs.sh
@@ -120,6 +120,7 @@ determine_real_args() {
 	set_config_with_override BOOL   GPG                  CMD_GPG
 	set_config_with_override BOOL   MDADM                CMD_MDADM
 	set_config_with_override STRING MDADM_CONFIG         CMD_MDADM_CONFIG
+	set_config_with_override BOOL   ZFS                  CMD_ZFS
 	set_config_with_override BOOL   MULTIPATH            CMD_MULTIPATH
 	set_config_with_override BOOL   FIRMWARE             CMD_FIRMWARE
 	set_config_with_override STRING FIRMWARE_DIR         CMD_FIRMWARE_DIR         "/lib/firmware"
diff --git a/gen_initramfs.sh b/gen_initramfs.sh
index 43fd77f4..170361bc 100755
--- a/gen_initramfs.sh
+++ b/gen_initramfs.sh
@@ -328,6 +328,31 @@ append_mdadm(){
 	rm -rf "${TEMP}/initramfs-mdadm-temp" > /dev/null
 }
 
+append_zfs(){
+	if [ -d "${TEMP}/initramfs-zfs-temp" ]
+	then
+		rm -r "${TEMP}/initramfs-zfs-temp"
+	fi
+
+	mkdir -p "${TEMP}/initramfs-zfs-temp/etc/zfs/"
+
+	# Copy files to /etc/zfs
+	for i in /etc/zfs/{zdev.conf,zpool.cache}
+	do
+		cp -a "${i}" "${TEMP}/initramfs-zfs-temp/etc/zfs" \
+			|| gen_die "Could not copy file ${i} for ZFS"
+	done
+
+	# Copy binaries
+	copy_binaries "${TEMP}/initramfs-zfs-temp" /sbin/{mount.zfs,zfs,zpool}
+
+	cd "${TEMP}/initramfs-zfs-temp/"
+	find . -print | cpio ${CPIO_ARGS} --append -F "${CPIO}" \
+			|| gen_die "compressing zfs cpio"
+	cd "${TEMP}"
+	rm -rf "${TEMP}/initramfs-zfs-temp" > /dev/null
+}
+
 append_splash(){
 	splash_geninitramfs=`which splash_geninitramfs 2>/dev/null`
 	if [ -x "${splash_geninitramfs}" ]
@@ -642,6 +667,8 @@ create_initramfs() {
 		print_info 1 "initramfs: Not copying modules..."
 	fi
 
+	append_data 'zfs' "${ZFS}"
+
 	append_data 'blkid' "${DISKLABEL}"
 
 	append_data 'unionfs_fuse' "${UNIONFS}"
diff --git a/genkernel b/genkernel
index 19ef6571..5883b5d9 100755
--- a/genkernel
+++ b/genkernel
@@ -351,6 +351,8 @@ then
 	[ "${DMRAID}" = '1' ] && print_warning 1 'add "dodmraid" for dmraid support'
 	[ "${MDADM}" = '1' ] && print_warning 1 'add "domdadm" for RAID support'
 	[ "${DMRAID}" = '1' ] && print_warning 1 '	or "dodmraid=<additional options>"'
+	[ "${ZFS}" = '1' ] && print_warning 1 'add "dozfs" for ZFS support'
+	[ "${ZFS}" = '1' ] && print_warning 1 '	and either "real_root=ZFS" to use bootfs autodetection or "real_root=ZFS=<dataset>" to force booting from a specific dataset'
 	[ "${ISCSI}" = '1' ] && print_warning 1 'add at least "iscsi_initiatorname=<initiator name> iscsi_target=<target name> and iscsi_address=<target ip>" for iscsi support'
 	if [ `grep 'CONFIG_EXT[0-9]_FS=' "${KERNEL_DIR}"/.config | wc -l` -ge 2 ]; then
 		print_warning 1 'With support for several ext* filesystems around it may be needed to'