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| author | Gao Xiang <hsiangkao@linux.alibaba.com> | 2021-10-11 05:31:45 +0800 |
|---|---|---|
| committer | Gao Xiang <hsiangkao@linux.alibaba.com> | 2021-10-19 23:44:30 +0800 |
| commit | 622ceaddb7649ca328832f50ba1400af778d75fa (patch) | |
| tree | 6e6a3db1cff711620944b9e283c2bd5f4dbd6171 /fs/erofs/Kconfig | |
| parent | 966edfb0a3dc2adf5aab461c298fa0feb02f49d6 (diff) | |
| download | linux-622ceaddb7649ca328832f50ba1400af778d75fa.tar.bz2 | |
erofs: lzma compression support
Add MicroLZMA support in order to maximize compression ratios for
specific scenarios. For example, it's useful for low-end embedded
boards and as a secondary algorithm in a file for specific access
patterns.
MicroLZMA is a new container format for raw LZMA1, which was created
by Lasse Collin aiming to minimize old LZMA headers and get rid of
unnecessary EOPM (end of payload marker) as well as to enable
fixed-sized output compression, especially for 4KiB pclusters.
Similar to LZ4, inplace I/O approach is used to minimize runtime
memory footprint when dealing with I/O. Overlapped decompression is
handled with 1) bounced buffer for data under processing or 2) extra
short-lived pages from the on-stack pagepool which will be shared in
the same read request (128KiB for example).
Link: https://lore.kernel.org/r/20211010213145.17462-8-xiang@kernel.org
Acked-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Diffstat (limited to 'fs/erofs/Kconfig')
| -rw-r--r-- | fs/erofs/Kconfig | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/fs/erofs/Kconfig b/fs/erofs/Kconfig index addfe608d08e..f57255ab88ed 100644 --- a/fs/erofs/Kconfig +++ b/fs/erofs/Kconfig @@ -82,3 +82,19 @@ config EROFS_FS_ZIP Enable fixed-sized output compression for EROFS. If you don't want to enable compression feature, say N. + +config EROFS_FS_ZIP_LZMA + bool "EROFS LZMA compressed data support" + depends on EROFS_FS_ZIP + select XZ_DEC + select XZ_DEC_MICROLZMA + help + Saying Y here includes support for reading EROFS file systems + containing LZMA compressed data, specifically called microLZMA. it + gives better compression ratios than the LZ4 algorithm, at the + expense of more CPU overhead. + + LZMA support is an experimental feature for now and so most file + systems will be readable without selecting this option. + + If unsure, say N. |