mirror of
https://github.com/PartialVolume/shredos.x86_64.git
synced 2026-02-20 09:35:26 +00:00
135 lines
4.0 KiB
Plaintext
135 lines
4.0 KiB
Plaintext
config BR2_TARGET_ROOTFS_EROFS
|
|
bool "erofs root filesystem"
|
|
select BR2_PACKAGE_HOST_EROFS_UTILS
|
|
help
|
|
Build a EROFS root filesystem.
|
|
|
|
if BR2_TARGET_ROOTFS_EROFS
|
|
|
|
choice
|
|
prompt "Compression algorithm"
|
|
default BR2_TARGET_ROOTFS_EROFS_LZ4HC
|
|
help
|
|
Select the EROFS compression algorithm to use.
|
|
|
|
LZ4HC (LZ4 High Compression) is the default algorithm and
|
|
provides a good balance between compression ratio and speed,
|
|
with increasing levels the compression ratio increases at the
|
|
penalty of higher compression times, without significant
|
|
decompression penalty.
|
|
|
|
LZMA provides the best compression ratio but is significantly
|
|
slower both in compression and decompression, and higher
|
|
compression levels can have noticeable memory requirements.
|
|
|
|
Custom compression allows for advanced configuration of the
|
|
compression algorithms, and adds the possibility of
|
|
finegrained per-file compression using compression hints.
|
|
|
|
config BR2_TARGET_ROOTFS_EROFS_NONE
|
|
bool "no compression"
|
|
|
|
config BR2_TARGET_ROOTFS_EROFS_LZ4HC
|
|
bool "lz4hc"
|
|
|
|
config BR2_TARGET_ROOTFS_EROFS_LZMA
|
|
bool "lzma"
|
|
|
|
config BR2_TARGET_ROOTFS_EROFS_CUSTOM_COMPRESSION
|
|
bool "custom"
|
|
|
|
endchoice
|
|
|
|
if BR2_TARGET_ROOTFS_EROFS_LZ4HC
|
|
|
|
config BR2_TARGET_ROOTFS_EROFS_LZ4HC_LEVEL
|
|
int "lz4hc compression level"
|
|
default 9
|
|
range 1 12
|
|
help
|
|
Specify the compression level for LZ4HC compression.
|
|
|
|
endif # BR2_TARGET_ROOTFS_EROFS_LZ4HC
|
|
|
|
if BR2_TARGET_ROOTFS_EROFS_LZMA
|
|
|
|
config BR2_TARGET_ROOTFS_EROFS_LZMA_LEVEL
|
|
int "lzma compression level"
|
|
default 6
|
|
range 0 109
|
|
help
|
|
Specify the compression level for LZMA compression.
|
|
|
|
Values from 0 to 9 are used for the standard compression,
|
|
values from 100 to 109 are used for the extreme compression.
|
|
|
|
endif # BR2_TARGET_ROOTFS_EROFS_LZMA
|
|
|
|
if BR2_TARGET_ROOTFS_EROFS_CUSTOM_COMPRESSION
|
|
|
|
config BR2_TARGET_ROOTFS_EROFS_COMPRESSION_ALGORITHMS
|
|
string "compression algorithms"
|
|
default "lz4hc,12"
|
|
help
|
|
Specify arbitrary compression option, useful in combination
|
|
with compression hints. Individual algorithms are separated
|
|
by colon with optional level, e.g. "lz4hc,12:lzma".
|
|
See erofs-utils documentaion for detailed information.
|
|
|
|
config BR2_TARGET_ROOTFS_EROFS_COMPRESSION_HINTS
|
|
string "path to compression hints file"
|
|
default ""
|
|
help
|
|
Path to file containing compression hints. Each line in the
|
|
file is defined by tokens separated by spaces in the
|
|
following form. Optionally, instead of the given primary
|
|
algorithm, algorithms can be specified with zero-based
|
|
algorithm-index explicitly:
|
|
|
|
<pcluster-size-in-bytes> [algorithm-index] <match-pattern>
|
|
|
|
match-patterns are extended regular expressions, matched
|
|
against absolute paths within the output filesystem, with no
|
|
leading /.
|
|
|
|
endif # BR2_TARGET_ROOTFS_EROFS_LZMA
|
|
|
|
config BR2_TARGET_ROOTFS_EROFS_DEDUPE
|
|
bool "enable data deduplication"
|
|
depends on !BR2_TARGET_ROOTFS_EROFS_NONE
|
|
help
|
|
Enable global compressed data deduplication to reduce FS image
|
|
size. Introduced in Linux 6.1.
|
|
|
|
config BR2_TARGET_ROOTFS_EROFS_FRAGMENTS
|
|
bool "enable fragments packing"
|
|
help
|
|
Pack the tail part (pcluster) of compressed files, or entire
|
|
files, into a special inode for smaller image size.
|
|
Introduced in Linux 6.1.
|
|
|
|
config BR2_TARGET_ROOTFS_EROFS_ALL_FRAGMENTS
|
|
bool "enable all-fragments packing"
|
|
help
|
|
Forcely record the whole files into a special inode for better
|
|
compression. Introduced in Linux 6.1.
|
|
|
|
config BR2_TARGET_ROOTFS_EROFS_ZTAILPACKING
|
|
bool "enable ztailpacking"
|
|
help
|
|
Pack the tail part (pcluster) of compressed files into its
|
|
metadata to save more space and the tail part I/O. Introduced
|
|
in Linux 5.17.
|
|
|
|
config BR2_TARGET_ROOTFS_EROFS_PCLUSTERSIZE
|
|
int "pcluster size"
|
|
default 0
|
|
help
|
|
Specify the maximum size of physical cluster in bytes, as a
|
|
multiple of 4KiB, for the big pcluster feature in order to
|
|
get much better compression ratios (thus better sequential
|
|
read performance for common storage devices), which has been
|
|
introduced since Linux 5.13.
|
|
|
|
endif # BR2_TARGET_ROOTFS_EROFS
|