image: ext4: allow to choose a block size for the rootfs

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

SVN-Revision: 40924

config/Config-images.in

@@ -86,6 +86,30 @@ menu "Target Images"
 			help
 			  Allows you to change the percentage of reserved blocks in the root filesystem
 
+		choice
+			prompt "Root filesystem block size""
+			default TARGET_EXT4_BLOCKSIZE_4K
+			depends TARGET_ROOTFS_EXT4FS
+			help
+			  Allows you to change the block size of the root filesystem
+
+			config TARGET_EXT4_BLOCKSIZE_4K
+				bool "4k"
+
+			config TARGET_EXT4_BLOCKSIZE_2K
+				bool "2k"
+
+			config TARGET_EXT4_BLOCKSIZE_1K
+				bool "1k"
+		endchoice
+
+		config TARGET_EXT4_BLOCKSIZE
+			int
+			default 4096 if TARGET_EXT4_BLOCKSIZE_4K
+			default 2048 if TARGET_EXT4_BLOCKSIZE_2K
+			default 1024 if TARGET_EXT4_BLOCKSIZE_1K
+			depends TARGET_ROOTFS_EXT4FS
+
 	config TARGET_ROOTFS_ISO
 		bool "iso"
 		default n

include/image.mk

@@ -184,11 +184,11 @@ ifneq ($(CONFIG_TARGET_ROOTFS_TARGZ),)
 endif
 
 ifneq ($(CONFIG_TARGET_ROOTFS_EXT4FS),)
-  E2SIZE=$(shell echo $$(($(CONFIG_TARGET_ROOTFS_PARTSIZE)*1024)))
+  E2SIZE=$(shell echo $$(($(CONFIG_TARGET_ROOTFS_PARTSIZE)*1024*1024/$(CONFIG_TARGET_EXT4_BLOCKSIZE))))
 
   define Image/mkfs/ext4
 # generate an ext2 fs
-	$(STAGING_DIR_HOST)/bin/genext2fs -U -b $(E2SIZE) -N $(CONFIG_TARGET_ROOTFS_MAXINODE) -d $(TARGET_DIR)/ $(KDIR)/root.ext4 -m $(CONFIG_TARGET_ROOTFS_RESERVED_PCT) $(MKFS_DEVTABLE_OPT)
+	$(STAGING_DIR_HOST)/bin/genext2fs -U -B $(CONFIG_TARGET_EXT4_BLOCKSIZE) -b $(E2SIZE) -N $(CONFIG_TARGET_ROOTFS_MAXINODE) -d $(TARGET_DIR)/ $(KDIR)/root.ext4 -m $(CONFIG_TARGET_ROOTFS_RESERVED_PCT) $(MKFS_DEVTABLE_OPT)
 # convert it to ext4
 	$(STAGING_DIR_HOST)/bin/tune2fs -O extents,uninit_bg,dir_index $(KDIR)/root.ext4
 # fix it up