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Diffstat (limited to 'fs/smb/client/compress.h')
| -rw-r--r-- | fs/smb/client/compress.h | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/fs/smb/client/compress.h b/fs/smb/client/compress.h new file mode 100644 index 000000000..e08e6d339 --- /dev/null +++ b/fs/smb/client/compress.h @@ -0,0 +1,50 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2024, SUSE LLC + * + * Authors: Enzo Matsumiya <ematsumiya@suse.de> + * + * This file implements I/O compression support for SMB2 messages (SMB 3.1.1 only). + * See compress/ for implementation details of each algorithm. + * + * References: + * MS-SMB2 "3.1.4.4 Compressing the Message" - for compression details + * MS-SMB2 "3.1.5.3 Decompressing the Chained Message" - for decompression details + * MS-XCA - for details of the supported algorithms + */ +#ifndef _SMB_COMPRESS_H +#define _SMB_COMPRESS_H + +#include <linux/uio.h> +#include <linux/kernel.h> +#include "../common/smb2pdu.h" +#include "../common/compress/compress.h" +#include "cifsglob.h" + +/* sizeof(smb2_compression_hdr) - sizeof(OriginalPayloadSize) */ +#define SMB_COMPRESS_HDR_LEN 16 +/* sizeof(smb2_compression_payload_hdr) - sizeof(OriginalPayloadSize) */ +#define SMB_COMPRESS_PAYLOAD_HDR_LEN 8 +#define SMB_COMPRESS_MIN_LEN PAGE_SIZE + +#ifdef CONFIG_CIFS_COMPRESSION +typedef int (*compress_send_fn)(struct TCP_Server_Info *, int, struct smb_rqst *); + + +int smb_compress(struct TCP_Server_Info *server, struct smb_rqst *rq, + compress_send_fn send_fn); +bool should_compress(const struct cifs_tcon *tcon, const struct smb_rqst *rq); + +#else /* !CONFIG_CIFS_COMPRESSION */ +static inline int smb_compress(void *unused1, void *unused2, void *unused3) +{ + return -EOPNOTSUPP; +} + +static inline bool should_compress(void *unused1, void *unused2) +{ + return false; +} + +#endif /* !CONFIG_CIFS_COMPRESSION */ +#endif /* _SMB_COMPRESS_H */ |