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ntfs: introduce transparent compression codec interface

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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 <hyc.lee@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
This commit is contained in:
Hyunchul Lee
2026-08-21 14:00:50 +09:00
committed by Namjae Jeon
parent 766062a82e
commit f2240a2ff4
1 changed files with 46 additions and 0 deletions
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46
fs/ntfs/ntfs_codec.h Normal file
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/* 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 <linux/types.h>
#include <linux/fs.h>
#include <linux/mm.h>
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 */