smb_compress...ress_chained(9)

💖 NAME 💖

okay bestie, welcome to the smb_compress...ress_chained(9) page from the Kernel API Manual — and the main character here is smb_compression_compress_chained, which builds a chained SMB2 transform. periodt. 💅✨

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🦋 SYNOPSIS 🦋

int smb_compression_compress_chained (__le16 alg , bool allow_pattern , const void *src , u32 slen , void *dst , u32 *dlen );

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🌸 ARGUMENTS 🌸

• alg — the negotiated general-purpose compression algorithm 👑
• allow_pattern — whether Pattern_V1 was negotiated 🧚
• src — the complete uncompressed SMB2 message 💌
• slen — the size of src 📏
• dst — the output buffer for the transform 🎀
• dlen — the input capacity of dst and the output transform size 🔥

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✨ DESCRIPTION ✨

So here's the vibe: following the algorithm in [MS-SMB2] 3.1.4.4, this helper encodes sufficiently long repeated runs at the front and back as Pattern_V1 payloads. 🫶

It compresses a middle region larger than 1 KiB with LZ77; smaller middle regions are represented by a chained NONE payload. no cap, that's the whole shape of it. 💀

important bestie note: this helper does not decide whether the final transform is smaller than the original message. The transport caller owns that policy decision, fr fr. 🙈

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⭐ RETURN ⭐

It returns 0 on success, otherwise a negative errno. slay. 💖

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🌈 SEE ALSO 🌈

• Kernel file ./fs/smb/common/compress/compress.c 📁
• smb_compression_decompress(9) 🔍

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okay that's the whole page, bestie — source/version ./fs/smb/common/compress, dated October 2026, page smb_compress...ress_chained(9). iconic 💅🎀