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Enable system partition compression

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* Prerequisites: external/f2fs-tools: sload compression support
* Must work with corresponding changes in system/extras repository
* If Board config does not change, it falls back to old behavior,
  i.e. no compression for the system partition
* Kernel f2fs compression support is a prerequisite if the Board config
  enables the compression (see below)
* Necessary board config change
 (e.g. device/<vendor>/<product>/BoardConfig-common.mk)

BOARD_SYSTEMIMAGE_FILE_SYSTEM_TYPE := f2fs
BOARD_SYSTEMIMAGE_PARTITION_RESERVED_SIZE := 200000000
BOARD_SYSTEMIMAGE_FILE_SYSTEM_COMPRESS := true
BOARD_SYSTEMIMAGE_F2FS_SLOAD_COMPRESS_FLAGS := <sload compress sub-options>

Setting BOARD_SYSTEMIMAGE_FILE_SYSTEM_COMPRESS to true enables both the
compression support when the initial empty file system be made (mkfs.f2fs)
and the compression flag (-c) when the system image files be side-loaded
by sload.

Sload compress sub-options (i.e. options other than -c) will be provided
by BOARD_SYSTEMIMAGE_F2FS_SLOAD_COMPRESS_FLAGS.   If it is not given, or
is empty, the default sub-options will be used

Please refer to the sload.f2fs manual page.

Setting BOARD_SYSTEMIMAGE_FILE_SYSTEM_TYPE to f2fs is trivially necessary.

* File system table (fstab), notably the file 'fstab.hardware', should
  also changed:
  - The file type must be changed to f2fs
  - Perhaps also other f2fs-specific options

Bug: 170918499
Test: Pixel4a userdebug build (from build id 6918751)
Signed-off-by: Robin Hsu <robinhsu@google.com>
Change-Id: Id9d67b5cb35dc806e06ff1320e89114abc996a28
This commit is contained in:
Robin Hsu
2020-11-04 09:29:09 +08:00
parent 748d568b29
commit 3e51f4234c
2 changed files with 14 additions and 1 deletions
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13
tools/releasetools/build_image.py
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@@ -350,8 +350,17 @@ def BuildImageMkfs(in_dir, prop_dict, out_file, target_out, fs_config):
build_command.append("--prjquota")
if (needs_casefold):
build_command.append("--casefold")
if (needs_compress):
if (needs_compress or prop_dict.get("system_fs_compress") == "true"):
build_command.append("--compression")
if (prop_dict.get("system_fs_compress") == "true"):
build_command.append("--sldc")
if (prop_dict.get("system_f2fs_sldc_flags") == None):
build_command.append(str(0))
else:
sldc_flags_str = prop_dict.get("system_f2fs_sldc_flags")
sldc_flags = sldc_flags_str.split()
build_command.append(str(len(sldc_flags)))
build_command.extend(sldc_flags)
else:
raise BuildImageError(
"Error: unknown filesystem type: {}".format(fs_type))
@@ -546,6 +555,8 @@ def ImagePropFromGlobalDict(glob_dict, mount_point):
"extfs_sparse_flag",
"erofs_sparse_flag",
"squashfs_sparse_flag",
"system_fs_compress",
"system_f2fs_sldc_flags",
"f2fs_sparse_flag",
"skip_fsck",
"ext_mkuserimg",