From f2240a2ff4db3a63c8740a9074ad98cb13d9b83b Mon Sep 17 00:00:00 2001 From: Hyunchul Lee Date: Fri, 21 Aug 2026 14:00:50 +0900 Subject: [PATCH] ntfs: introduce transparent compression codec interface Introduce struct ntfs_codec_ops and enum ntfs_codec_id to provide a unified interface for compression and decompression algorithms. This interface supports WOF and LZNT1 decompression. Signed-off-by: Hyunchul Lee Signed-off-by: Namjae Jeon --- fs/ntfs/ntfs_codec.h | 46 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 fs/ntfs/ntfs_codec.h diff --git a/fs/ntfs/ntfs_codec.h b/fs/ntfs/ntfs_codec.h new file mode 100644 index 000000000000..14a69d1e4d7f --- /dev/null +++ b/fs/ntfs/ntfs_codec.h @@ -0,0 +1,46 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Transparent compression codec interface. + * + * Copyright (c) 2026 LG Electronics Co., Ltd. + */ + +#ifndef _NTFS_CODEC_H +#define _NTFS_CODEC_H + +#include +#include +#include + +struct compress_context; + +enum ntfs_codec_id { + NTFS_CODEC_LZNT1, +#ifdef CONFIG_NTFS_FS_WOF_COMPRESSION + NTFS_CODEC_XPRESS4K, + NTFS_CODEC_XPRESS8K, + NTFS_CODEC_XPRESS16K, + NTFS_CODEC_LZX32K, +#endif +}; + +struct ntfs_codec_ops { + enum ntfs_codec_id id; + const char *name; + size_t (*scratch_size)(u32 chunk_size); + int (*decompress_chunk)(void *scratch, + const void *src, size_t src_len, + void *dst, size_t dst_len, + u32 chunk_size); + int (*decompress_pages)(struct page *dest_pages[], + int completed_pages[], + int *dest_index, int *dest_ofs, + int dest_max_index, int dest_max_ofs, + int xpage, char *xpage_done, + u8 *cb_start, u32 cb_size, + loff_t i_size, s64 initialized_size); + int (*compress_subblock)(struct compress_context *pctx, + const char *inbuf, int bufsize, char *outbuf); +}; + +#endif /* _NTFS_CODEC_H */