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build: Add TARGET_ROOTFS_RESERVED_PCT option to reduce wasted space
The genext2fs tool will 'reserve' 5% of the image size by default, apparently by creating a huge lost+found directory. In fact it seemed to be much more than 5% in practice — I saw an image with 8MiB used, and recovered about 2MiB of it by deleting the 'empty' lost+found directory: /dev/loop0 48377 8482 37438 19% /mnt/spare # rmdir lost+found/ /dev/loop0 48377 6014 39906 14% /mnt/spare This makes it configurable, but leaves it at the genext2fs default of 5% for now. It should probably be changed to default to zero, but that can be a separate patch. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Gabor Juhos <juhosg@openwrt.org> git-svn-id: svn://svn.openwrt.org/openwrt/trunk@34408 3c298f89-4303-0410-b956-a3cf2f4a3e73
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@ -125,6 +125,13 @@ menu "Target Images"
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help
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Allows you to change the maximum number of inodes in the root filesystem
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config TARGET_ROOTFS_RESERVED_PCT
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int "Percentage of reserved blocks in root filesystem"
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depends TARGET_ROOTFS_EXT4FS
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default 5
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help
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Allows you to change the percentage of reserved blocks in the root filesystem
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endmenu
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menu "Global build settings"
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@ -124,7 +124,7 @@ ifneq ($(CONFIG_TARGET_ROOTFS_EXT4FS),)
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define Image/mkfs/ext4
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# generate an ext2 fs
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$(STAGING_DIR_HOST)/bin/genext2fs -U -b $(E2SIZE) -N $(CONFIG_TARGET_ROOTFS_MAXINODE) -d $(TARGET_DIR)/ $(KDIR)/root.ext4
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$(STAGING_DIR_HOST)/bin/genext2fs -U -b $(E2SIZE) -N $(CONFIG_TARGET_ROOTFS_MAXINODE) -d $(TARGET_DIR)/ $(KDIR)/root.ext4 -m $(CONFIG_TARGET_ROOTFS_RESERVED_PCT)
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# convert it to ext4
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$(STAGING_DIR_HOST)/bin/tune2fs -O extents,uninit_bg,dir_index $(KDIR)/root.ext4
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# fix it up
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