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build: Add TARGET_ROOTFS_RESERVED_PCT option to reduce wasted space

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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>

SVN-Revision: 34408
This commit is contained in:
Gabor Juhos 2012-11-29 17:37:15 +00:00
parent 44131bd785
commit d90e805fe6
2 changed files with 8 additions and 1 deletions
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7
Config.in
View file

@ -125,6 +125,13 @@ menu "Target Images"
help help
Allows you to change the maximum number of inodes in the root filesystem Allows you to change the maximum number of inodes in the root filesystem
config TARGET_ROOTFS_RESERVED_PCT
int "Percentage of reserved blocks in root filesystem"
depends TARGET_ROOTFS_EXT4FS
default 5
help
Allows you to change the percentage of reserved blocks in the root filesystem
endmenu endmenu
menu "Global build settings" menu "Global build settings"

2
include/image.mk
View file

@ -124,7 +124,7 @@ ifneq ($(CONFIG_TARGET_ROOTFS_EXT4FS),)
define Image/mkfs/ext4 define Image/mkfs/ext4
# generate an ext2 fs # generate an ext2 fs
$(STAGING_DIR_HOST)/bin/genext2fs -U -b $(E2SIZE) -N $(CONFIG_TARGET_ROOTFS_MAXINODE) -d $(TARGET_DIR)/ $(KDIR)/root.ext4 $(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)
# convert it to ext4 # convert it to ext4
$(STAGING_DIR_HOST)/bin/tune2fs -O extents,uninit_bg,dir_index $(KDIR)/root.ext4 $(STAGING_DIR_HOST)/bin/tune2fs -O extents,uninit_bg,dir_index $(KDIR)/root.ext4
# fix it up # fix it up