4 Commits

Author	SHA1	Message	Date
Gao Xiang	84a2ceefff	erofs: tidy up stream decompressors ... Just use a generic helper to prepare buffers for all supported stream decompressors, eliminating similar logic. Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com> Link: https://lore.kernel.org/r/20240709094106.3018109-3-hsiangkao@linux.alibaba.com	2024-07-09 19:04:41 +08:00
Gao Xiang	5a7cce827e	erofs: refine z_erofs_{init,exit}_subsystem() ... Introduce z_erofs_{init,exit}_decompressor() to unexport z_erofs_{deflate,lzma,zstd}_{init,exit}(). Besides, call them in z_erofs_{init,exit}_subsystem() for simplicity. Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com> Link: https://lore.kernel.org/r/20240709094106.3018109-2-hsiangkao@linux.alibaba.com	2024-07-09 19:04:40 +08:00
Gao Xiang	392d20ccef	erofs: move each decompressor to its own source file ... Thus *_config() function declarations can be avoided. Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com> Link: https://lore.kernel.org/r/20240709094106.3018109-1-hsiangkao@linux.alibaba.com	2024-07-09 19:04:40 +08:00
Gao Xiang	7c35de4df1	erofs: Zstandard compression support ... Add Zstandard compression as the 4th supported algorithm since it becomes more popular now and some end users have asked this for quite a while [1][2]. Each EROFS physical cluster contains only one valid standard Zstandard frame as described in [3] so that decompression can be performed on a per-pcluster basis independently. Currently, it just leverages multi-call stream decompression APIs with internal sliding window buffers. One-shot or bufferless decompression could be implemented later for even better performance if needed. [1] https://github.com/erofs/erofs-utils/issues/6 [2] https://lore.kernel.org/r/Y08h+z6CZdnS1XBm@B-P7TQMD6M-0146.lan [3] https://www.rfc-editor.org/rfc/rfc8478.txt Acked-by: Chao Yu <chao@kernel.org> Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com> Link: https://lore.kernel.org/r/20240508234453.17896-1-xiang@kernel.org	2024-05-09 07:46:56 +08:00