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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/decompressor.c | |
| parent | 966edfb0a3dc2adf5aab461c298fa0feb02f49d6 (diff) | |
| download | linux-622ceaddb7649ca328832f50ba1400af778d75fa.tar.gz linux-622ceaddb7649ca328832f50ba1400af778d75fa.tar.bz2 linux-622ceaddb7649ca328832f50ba1400af778d75fa.zip | |
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/decompressor.c')
| -rw-r--r-- | fs/erofs/decompressor.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/fs/erofs/decompressor.c b/fs/erofs/decompressor.c index 8fd7af9d6b38..8a624d73c185 100644 --- a/fs/erofs/decompressor.c +++ b/fs/erofs/decompressor.c @@ -16,12 +16,6 @@ #define LZ4_DECOMPRESS_INPLACE_MARGIN(srcsize) (((srcsize) >> 8) + 32) #endif -struct z_erofs_decompressor { - int (*decompress)(struct z_erofs_decompress_req *rq, - struct list_head *pagepool); - char *name; -}; - int z_erofs_load_lz4_config(struct super_block *sb, struct erofs_super_block *dsb, struct z_erofs_lz4_cfgs *lz4, int size) @@ -349,6 +343,12 @@ static struct z_erofs_decompressor decompressors[] = { .decompress = z_erofs_lz4_decompress, .name = "lz4" }, +#ifdef CONFIG_EROFS_FS_ZIP_LZMA + [Z_EROFS_COMPRESSION_LZMA] = { + .decompress = z_erofs_lzma_decompress, + .name = "lzma" + }, +#endif }; int z_erofs_decompress(struct z_erofs_decompress_req *rq, |