Add rootfstype= boot parameter (bug #221245)

ChangeLog

@@ -5,6 +5,13 @@
 # Distributed under the GPL v2
 # $Id$
 
+  31 May 2011; Sebastian Pipping <sping@gentoo.org> defaults/linuxrc,
+  doc/genkernel.8.txt:
+  Add rootfstype= boot parameter (bug #221245)
+
+  Special thanks:
+  - Marcin Kurek
+
   31 May 2011; Nelson Batalha <nelson.batalha@gmail.com> defaults/initrd.defaults:
   Add Kernel 3.0.0 support (bug #369481)
 

defaults/linuxrc

@@ -37,6 +37,7 @@ CMDLINE=`cat /proc/cmdline`
 # Scan CMDLINE for any specified real_root= or cdroot arguments
 FAKE_ROOT=''
 REAL_ROOTFLAGS=''
+ROOTFSTYPE='auto'
 CRYPT_SILENT=0
 for x in ${CMDLINE}
 do
@@ -212,6 +213,9 @@ do
 		real_rootflags\=*)
 			REAL_ROOTFLAGS=`parse_opt "${x}"`
 		;;
+		rootfstype\=*)
+			ROOTFSTYPE=`parse_opt "${x}"`
+		;;
 		keymap\=*)
 			keymap=`parse_opt "${x}"`
 		;;
@@ -495,10 +499,11 @@ do
 		else
 			# mount ro so fsck doesn't barf later
 			if [ "${REAL_ROOTFLAGS}" = '' ]; then
-				mount -o ro ${REAL_ROOT} ${NEW_ROOT}
+				good_msg "Using mount -t ${ROOTFSTYPE} -o ro"
+				mount -t ${ROOTFSTYPE} -o ro ${REAL_ROOT} ${NEW_ROOT}
 			else
-				good_msg "Using mount -o ro,${REAL_ROOTFLAGS}"
-				mount -o ro,${REAL_ROOTFLAGS} ${REAL_ROOT} ${NEW_ROOT}
+				good_msg "Using mount -t ${ROOTFSTYPE} -o ro,${REAL_ROOTFLAGS}"
+				mount -t ${ROOTFSTYPE} -o ro,${REAL_ROOTFLAGS} ${REAL_ROOT} ${NEW_ROOT}
 			fi
 		fi
 		

doc/genkernel.8.txt

@@ -440,6 +440,11 @@ which the ramdisk scripts would recognize.
 *dokeymap*::
     Use keymap.  Usage of *keymap*= implies this option, already.
 
+*rootfstype*=<...>::
+    Specify the file system type to mount the real root filesystem as.
+    This can be useful when support for ext2/ext3/ext4 are
+    in competition.  Default is "auto".
+
 
 NETBOOTING
 ----------

genkernel

@@ -353,6 +353,10 @@ then
 	[ "${MDADM}" = '1' ] && print_warning 1 'add "domdadm" for RAID support'
 	[ "${DMRAID}" = '1' ] && print_warning 1 '	or "dodmraid=<additional options>"'
 	[ "${ISCSI}" = '1' ] && print_warning 1 'add at least "iscsi_initiatorname=<initiator name> iscsi_target=<target name> and iscsi_address=<target ip>" for iscsi support'
+	if [ `grep 'CONFIG_EXT[0-9]_FS=' "${KERNEL_DIR}"/.config | wc -l` -ge 2 ]; then
+		print_warning 1 'With support for several ext* filesystems around it may be needed to'
+		print_warning 1 'add "rootfstype=ext3" or "rootfstype=ext4"'
+	fi
 fi
 
 [ "${BOOTRW}" != '' ] && mount -o remount,ro ${BOOTDIR}