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7ddb3fef35
Implement the transparent compression codec ops for XPRESS (4K, 8K, 16K) and LZX (32K) algorithms. The xpress_scratch_size, lzx_scratch_size, xpress_decompress_chunk, and lzx_decompress_chunk wrappers provide unified interfaces and use per-call dynamic scratch state allocation (avoiding global mutexed singletons). Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com> Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Transparent compression codec interface.
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*
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* Copyright (c) 2026 LG Electronics Co., Ltd.
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*/
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#ifndef _NTFS_CODEC_H
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#define _NTFS_CODEC_H
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#include <linux/types.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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struct compress_context;
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enum ntfs_codec_id {
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NTFS_CODEC_LZNT1,
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#ifdef CONFIG_NTFS_FS_WOF_COMPRESSION
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NTFS_CODEC_XPRESS4K,
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NTFS_CODEC_XPRESS8K,
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NTFS_CODEC_XPRESS16K,
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NTFS_CODEC_LZX32K,
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#endif
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};
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struct ntfs_codec_ops {
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enum ntfs_codec_id id;
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const char *name;
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size_t (*scratch_size)(u32 chunk_size);
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int (*decompress_chunk)(void *scratch,
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const void *src, size_t src_len,
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void *dst, size_t dst_len,
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u32 chunk_size);
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int (*decompress_pages)(struct page *dest_pages[],
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int completed_pages[],
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int *dest_index, int *dest_ofs,
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int dest_max_index, int dest_max_ofs,
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int xpage, char *xpage_done,
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u8 *cb_start, u32 cb_size,
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loff_t i_size, s64 initialized_size);
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int (*compress_subblock)(struct compress_context *pctx,
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const char *inbuf, int bufsize, char *outbuf);
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};
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extern const struct ntfs_codec_ops ntfs_lznt1_codec_ops;
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#ifdef CONFIG_NTFS_FS_WOF_COMPRESSION
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extern const struct ntfs_codec_ops ntfs_xpress4k_codec_ops;
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extern const struct ntfs_codec_ops ntfs_xpress8k_codec_ops;
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extern const struct ntfs_codec_ops ntfs_xpress16k_codec_ops;
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extern const struct ntfs_codec_ops ntfs_lzx32k_codec_ops;
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#endif
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#endif /* _NTFS_CODEC_H */
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