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.woodho...@intel.com>
---
For AA too.
Config.in | 7 +++++++
include/image.mk | 2 +-
2 files changed, 8 insertions(+), 1 deletions(-)
diff --git a/Config.in b/Config.in
index 46f7ce8..76acbe5 100644
--- a/Config.in
+++ b/Config.in
@@ -125,6 +125,13 @@ menu "Target Images"
help
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
menu "Global build settings"
diff --git a/include/image.mk b/include/image.mk
index 10850a6..503115d 100644
--- a/include/image.mk
+++ b/include/image.mk
@@ -124,7 +124,7 @@ ifneq ($(CONFIG_TARGET_ROOTFS_EXT4FS),)
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
+ $(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
$(STAGING_DIR_HOST)/bin/tune2fs -O extents,uninit_bg,dir_index
$(KDIR)/root.ext4
# fix it up
--
1.7.7.6
--
dwmw2
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