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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/zdata.c | |
| 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/zdata.c')
| -rw-r--r-- | fs/erofs/zdata.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c index 98d3bd25d894..d55e6215cd44 100644 --- a/fs/erofs/zdata.c +++ b/fs/erofs/zdata.c @@ -1404,8 +1404,8 @@ static void z_erofs_pcluster_readmore(struct z_erofs_decompress_frontend *f, if (backmost) { map->m_la = end; - /* TODO: pass in EROFS_GET_BLOCKS_READMORE for LZMA later */ - err = z_erofs_map_blocks_iter(inode, map, 0); + err = z_erofs_map_blocks_iter(inode, map, + EROFS_GET_BLOCKS_READMORE); if (err) return; |