1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2024, SUSE LLC 4 * 5 * Authors: Enzo Matsumiya <ematsumiya@suse.de> 6 * 7 * This file implements I/O compression support for SMB2 messages (SMB 3.1.1 only). 8 * See compress/ for implementation details of each algorithm. 9 * 10 * References: 11 * MS-SMB2 "3.1.4.4 Compressing the Message" - for compression details 12 * MS-SMB2 "3.1.5.3 Decompressing the Chained Message" - for decompression details 13 * MS-XCA - for details of the supported algorithms 14 */ 15 #ifndef _SMB_COMPRESS_H 16 #define _SMB_COMPRESS_H 17 18 #include <linux/uio.h> 19 #include <linux/kernel.h> 20 #include "../common/smb2pdu.h" 21 #include "../common/compress/compress.h" 22 #include "cifsglob.h" 23 24 /* sizeof(smb2_compression_hdr) - sizeof(OriginalPayloadSize) */ 25 #define SMB_COMPRESS_HDR_LEN 16 26 /* sizeof(smb2_compression_payload_hdr) - sizeof(OriginalPayloadSize) */ 27 #define SMB_COMPRESS_PAYLOAD_HDR_LEN 8 28 #define SMB_COMPRESS_MIN_LEN PAGE_SIZE 29 30 #ifdef CONFIG_CIFS_COMPRESSION 31 typedef int (*compress_send_fn)(struct TCP_Server_Info *, int, struct smb_rqst *); 32 33 34 int smb_compress(struct TCP_Server_Info *server, struct smb_rqst *rq, 35 compress_send_fn send_fn); 36 bool should_compress(const struct cifs_tcon *tcon, const struct smb_rqst *rq); 37 38 #else /* !CONFIG_CIFS_COMPRESSION */ 39 static inline int smb_compress(void *unused1, void *unused2, void *unused3) 40 { 41 return -EOPNOTSUPP; 42 } 43 44 static inline bool should_compress(void *unused1, void *unused2) 45 { 46 return false; 47 } 48 49 #endif /* !CONFIG_CIFS_COMPRESSION */ 50 #endif /* _SMB_COMPRESS_H */ 51