build_image: default extfs reserved size to 0 on RO partitions.
Defaults the reserved blocks for root to 0% on read only partitions
(system, system_other, vendor, oem). It also adds support for
explicitly specifying the extfs reserved percentage via
BOARD_{SYSTEM,VENDOR,OEM,PRODUCT}IMAGE_EXTFS_RSV_PCT.
This eventually translates down to the -m option for mkfs.
Removing the reserved space can save at least 5% from the default.
dumpe2fs system:
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
Bug: 75975085
Test: Build, verify reserved space is changed accordingly
Change-Id: I212d82741908b636db0d658a1c4847bbaadfd5ba
(cherry picked from commit 5ff758799c0ca8dda203107930d9cab2cc211b64)
diff --git a/core/Makefile b/core/Makefile
index 9481e26..0b7950b 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -1086,6 +1086,7 @@
$(if $(BOARD_SYSTEMIMAGE_PARTITION_SIZE),$(hide) echo "system_size=$(BOARD_SYSTEMIMAGE_PARTITION_SIZE)" >> $(1))
$(if $(BOARD_SYSTEMIMAGE_FILE_SYSTEM_TYPE),$(hide) echo "system_fs_type=$(BOARD_SYSTEMIMAGE_FILE_SYSTEM_TYPE)" >> $(1))
$(if $(BOARD_SYSTEMIMAGE_EXTFS_INODE_COUNT),$(hide) echo "system_extfs_inode_count=$(BOARD_SYSTEMIMAGE_EXTFS_INODE_COUNT)" >> $(1))
+$(if $(BOARD_SYSTEMIMAGE_EXTFS_RSV_PCT),$(hide) echo "system_extfs_rsv_pct=$(BOARD_SYSTEMIMAGE_EXTFS_RSV_PCT)" >> $(1))
$(if $(BOARD_SYSTEMIMAGE_JOURNAL_SIZE),$(hide) echo "system_journal_size=$(BOARD_SYSTEMIMAGE_JOURNAL_SIZE)" >> $(1))
$(if $(BOARD_EXT4_SHARE_DUP_BLOCKS),$(hide) echo "ext4_share_dup_blocks=$(BOARD_EXT4_SHARE_DUP_BLOCKS)" >> $(1))
$(if $(BOARD_SYSTEMIMAGE_SQUASHFS_COMPRESSOR),$(hide) echo "system_squashfs_compressor=$(BOARD_SYSTEMIMAGE_SQUASHFS_COMPRESSOR)" >> $(1))
@@ -1102,6 +1103,7 @@
$(if $(BOARD_CACHEIMAGE_PARTITION_SIZE),$(hide) echo "cache_size=$(BOARD_CACHEIMAGE_PARTITION_SIZE)" >> $(1))
$(if $(BOARD_VENDORIMAGE_FILE_SYSTEM_TYPE),$(hide) echo "vendor_fs_type=$(BOARD_VENDORIMAGE_FILE_SYSTEM_TYPE)" >> $(1))
$(if $(BOARD_VENDORIMAGE_EXTFS_INODE_COUNT),$(hide) echo "vendor_extfs_inode_count=$(BOARD_VENDORIMAGE_EXTFS_INODE_COUNT)" >> $(1))
+$(if $(BOARD_VENDORIMAGE_EXTFS_RSV_PCT),$(hide) echo "vendor_extfs_rsv_pct=$(BOARD_VENDORIMAGE_EXTFS_RSV_PCT)" >> $(1))
$(if $(BOARD_VENDORIMAGE_PARTITION_SIZE),$(hide) echo "vendor_size=$(BOARD_VENDORIMAGE_PARTITION_SIZE)" >> $(1))
$(if $(BOARD_VENDORIMAGE_JOURNAL_SIZE),$(hide) echo "vendor_journal_size=$(BOARD_VENDORIMAGE_JOURNAL_SIZE)" >> $(1))
$(if $(BOARD_VENDORIMAGE_SQUASHFS_COMPRESSOR),$(hide) echo "vendor_squashfs_compressor=$(BOARD_VENDORIMAGE_SQUASHFS_COMPRESSOR)" >> $(1))
@@ -1111,6 +1113,7 @@
$(if $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_VENDOR_BASE_FS_PATH),$(hide) echo "vendor_base_fs_file=$(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_VENDOR_BASE_FS_PATH)" >> $(1))
$(if $(BOARD_PRODUCTIMAGE_FILE_SYSTEM_TYPE),$(hide) echo "product_fs_type=$(BOARD_PRODUCTIMAGE_FILE_SYSTEM_TYPE)" >> $(1))
$(if $(BOARD_PRODUCTIMAGE_EXTFS_INODE_COUNT),$(hide) echo "product_extfs_inode_count=$(BOARD_PRODUCTIMAGE_EXTFS_INODE_COUNT)" >> $(1))
+$(if $(BOARD_PRODUCTIMAGE_EXTFS_RSV_PCT),$(hide) echo "product_extfs_rsv_pct=$(BOARD_PRODUCTIMAGE_EXTFS_RSV_PCT)" >> $(1))
$(if $(BOARD_PRODUCTIMAGE_PARTITION_SIZE),$(hide) echo "product_size=$(BOARD_PRODUCTIMAGE_PARTITION_SIZE)" >> $(1))
$(if $(BOARD_PRODUCTIMAGE_JOURNAL_SIZE),$(hide) echo "product_journal_size=$(BOARD_PRODUCTIMAGE_JOURNAL_SIZE)" >> $(1))
$(if $(BOARD_PRODUCTIMAGE_SQUASHFS_COMPRESSOR),$(hide) echo "product_squashfs_compressor=$(BOARD_PRODUCTIMAGE_SQUASHFS_COMPRESSOR)" >> $(1))
@@ -1121,6 +1124,7 @@
$(if $(BOARD_OEMIMAGE_PARTITION_SIZE),$(hide) echo "oem_size=$(BOARD_OEMIMAGE_PARTITION_SIZE)" >> $(1))
$(if $(BOARD_OEMIMAGE_JOURNAL_SIZE),$(hide) echo "oem_journal_size=$(BOARD_OEMIMAGE_JOURNAL_SIZE)" >> $(1))
$(if $(BOARD_OEMIMAGE_EXTFS_INODE_COUNT),$(hide) echo "oem_extfs_inode_count=$(BOARD_OEMIMAGE_EXTFS_INODE_COUNT)" >> $(1))
+$(if $(BOARD_OEMIMAGE_EXTFS_RSV_PCT),$(hide) echo "oem_extfs_rsv_pct=$(BOARD_OEMIMAGE_EXTFS_RSV_PCT)" >> $(1))
$(if $(INTERNAL_USERIMAGES_SPARSE_EXT_FLAG),$(hide) echo "extfs_sparse_flag=$(INTERNAL_USERIMAGES_SPARSE_EXT_FLAG)" >> $(1))
$(if $(INTERNAL_USERIMAGES_SPARSE_SQUASHFS_FLAG),$(hide) echo "squashfs_sparse_flag=$(INTERNAL_USERIMAGES_SPARSE_SQUASHFS_FLAG)" >> $(1))
$(hide) echo "selinux_fc=$(SELINUX_FC)" >> $(1)