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Namjae JeonandSteve French
0121b15414
Move the LZ77 codec in cifs.ko to smb/common/ so both the SMB client and ksmbd can use it. Signed-off-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com>
51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2024, SUSE LLC
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*
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* Authors: Enzo Matsumiya <ematsumiya@suse.de>
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*
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* This file implements I/O compression support for SMB2 messages (SMB 3.1.1 only).
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* See compress/ for implementation details of each algorithm.
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*
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* References:
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* MS-SMB2 "3.1.4.4 Compressing the Message" - for compression details
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* MS-SMB2 "3.1.5.3 Decompressing the Chained Message" - for decompression details
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* MS-XCA - for details of the supported algorithms
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*/
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#ifndef _SMB_COMPRESS_H
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#define _SMB_COMPRESS_H
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#include <linux/uio.h>
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#include <linux/kernel.h>
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#include "../common/smb2pdu.h"
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#include "../common/compress/compress.h"
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#include "cifsglob.h"
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/* sizeof(smb2_compression_hdr) - sizeof(OriginalPayloadSize) */
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#define SMB_COMPRESS_HDR_LEN 16
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/* sizeof(smb2_compression_payload_hdr) - sizeof(OriginalPayloadSize) */
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#define SMB_COMPRESS_PAYLOAD_HDR_LEN 8
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#define SMB_COMPRESS_MIN_LEN PAGE_SIZE
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#ifdef CONFIG_CIFS_COMPRESSION
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typedef int (*compress_send_fn)(struct TCP_Server_Info *, int, struct smb_rqst *);
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int smb_compress(struct TCP_Server_Info *server, struct smb_rqst *rq,
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compress_send_fn send_fn);
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bool should_compress(const struct cifs_tcon *tcon, const struct smb_rqst *rq);
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#else /* !CONFIG_CIFS_COMPRESSION */
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static inline int smb_compress(void *unused1, void *unused2, void *unused3)
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{
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return -EOPNOTSUPP;
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}
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static inline bool should_compress(void *unused1, void *unused2)
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{
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return false;
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}
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#endif /* !CONFIG_CIFS_COMPRESSION */
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#endif /* _SMB_COMPRESS_H */
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