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| author | Gao Xiang <hsiangkao@linux.alibaba.com> | 2024-05-09 02:44:53 +0300 |
|---|---|---|
| committer | Gao Xiang <hsiangkao@linux.alibaba.com> | 2024-05-09 02:46:56 +0300 |
| commit | 7c35de4df1056a5a1fb4de042197b8f5b1033b61 (patch) | |
| tree | 44d235d68bdeeb597c516ec547ed8781b369a096 /fs/erofs/internal.h | |
| parent | d69189428d50c9a8de6475f3c8c241f86f4e764a (diff) | |
| download | linux-7c35de4df1056a5a1fb4de042197b8f5b1033b61.tar.xz | |
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
Diffstat (limited to 'fs/erofs/internal.h')
| -rw-r--r-- | fs/erofs/internal.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h index 53ebba952a2f..21def866a482 100644 --- a/fs/erofs/internal.h +++ b/fs/erofs/internal.h @@ -502,6 +502,14 @@ static inline int z_erofs_deflate_init(void) { return 0; } static inline int z_erofs_deflate_exit(void) { return 0; } #endif /* !CONFIG_EROFS_FS_ZIP_DEFLATE */ +#ifdef CONFIG_EROFS_FS_ZIP_ZSTD +int __init z_erofs_zstd_init(void); +void z_erofs_zstd_exit(void); +#else +static inline int z_erofs_zstd_init(void) { return 0; } +static inline int z_erofs_zstd_exit(void) { return 0; } +#endif /* !CONFIG_EROFS_FS_ZIP_ZSTD */ + #ifdef CONFIG_EROFS_FS_ONDEMAND int erofs_fscache_register_fs(struct super_block *sb); void erofs_fscache_unregister_fs(struct super_block *sb); |