Re: [PATCH] erofs: Zstandard compression support

From: Chao Yu
Date: Wed May 08 2024 - 09:12:16 EST


On 2024/5/8 17:03, Gao Xiang wrote:
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@xxxxxxxxxxxxxxxxxxx
[3] https://www.rfc-editor.org/rfc/rfc8478.txt
Signed-off-by: Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx>

Acked-by: Chao Yu <chao@xxxxxxxxxx>

Thanks,