smb_compression_decompress(9)

🎀 NAME 🎀

smb_compression_decompress — decode an SMB2 compression transform. This is the smb_compression_decompress(9) page from the Kernel API Manual, bestie, and it's lowkey iconic. 💅

✨ SYNOPSIS ✨

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

That's the signature, fr fr. 🫶

🌸 ARGUMENTS 🌸

• alg — the negotiated general-purpose compression algorithm. the chosen one of this whole operation, iykyk.
• allow_chained — whether chained transforms were negotiated. the chained-transform vibe check.
• allow_pattern — whether Pattern_V1 payloads were negotiated. the Pattern_V1 negotiation flag, got it.
• src — transform header followed by compressed payload data. the whole little package: header plus payload data.
• slen — total number of bytes available at src. literally the total byte count at src.
• dst — output buffer for the reconstructed SMB2 message. this is where the reconstructed message lands. 🎀
• dlen — exact expected size of the reconstructed SMB2 message. not approximate, exact. periodt.

💖 DESCRIPTION 💖

Okay so the flow is: validate the transform type and the negotiated capabilities first, then dispatch to the chained or unchained decoder. slay. The caller supplies the expected output size after applying its transport-specific message size limits. No cap. ✨

🦋 RETURN 🦋

• 0 on success 💖
• otherwise a negative errno 😭

🌈 SEE ALSO 🌈

• Kernel file ./fs/smb/common/compress/compress.c — the kernel file to check out.
• smb_compression_compress_chained(9) — another man page in the group chat.

xoxo 💋 — source/version: ./fs/smb/common/compress; date: October 2026. catch you later, bestie! 🫶