STRUCT ACOMP_REQ(9)

💅 struct acomp_req(9) — like, the whole vibe check on asynchronous (de)compression requests 🎀

okay so this is a page from the Kernel API Manual, and bestie, we're talking about struct acomp_req — the asynchronous (de)compression request. it's giving "small struct, big responsibilities" and honestly? iconic. 🦋

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✨ NAME ✨

struct acomp_req — asynchronous (de)compression request. literally what it says on the tin, no cap. 🫶

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🌸 SYNOPSIS 🌸

here's the whole thing, character for character, because we do not paraphrase code in this house:

struct acomp_req {
    struct crypto_async_request base;
    union {
      struct scatterlist *src;
      const u8 *svirt;
    };
    union {
      struct scatterlist *dst;
      u8 *dvirt;
    };
    unsigned int slen;
    unsigned int dlen;
    struct acomp_req_chain chain;
    void *__ctx[];
 };

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👑 Members 👑

okay, field by field, let's go — this is the main character energy part of the page:

• base — the common attributes for asynchronous crypto requests. it's the shared DNA, the group-chat-everyone's-in. 💫
• {unnamed_union} — anonymous. yes, that's literally the note. it's an unnamed union and the manpage just says "anonymous". mysterious. we respect it. 🙈
• src — source scatterlist.
• svirt — source virtual address.
• {unnamed_union} — anonymous. again! a second unnamed union, also "anonymous". slay, we love a consistent queen. ✨
• dst — destination scatterlist.
• dvirt — destination virtual address.
• slen — size of the input buffer.
• dlen — size of the output buffer and the number of bytes produced. yes, it's doing double duty, highkey a multitasker. 🔥
• chain — private API code data, do not use. bestie, i'm serious, hands off. this is not your data, it's the API's data. 💀
• __ctx — start of private context data. the beginning of the mystery box. 🎁

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🌈 SEE ALSO 🌈

go read these next, i promise it's a whole rabbit hole and it's worth it (iykyk):

• Kernel file ./include/crypto/acompress.h struct crypto_acomp(9)
• Asynchronous Compression API(9)
• crypto_alloc_acomp(9)
• crypto_alloc_acomp_node(9)
• crypto_free_acomp(9)
• acomp_request_alloc_extra(9)
• acomp_request_alloc_extra(9)
• acomp_request_free(9)
• acomp_request_set_callback(9)
• acomp_request_set_params(9)
• acomp_request_set_src_sg(9)
• acomp_request_set_src_dma(9)
• acomp_request_set_src_nondma(9)
• acomp_request_set_src_folio(9)
• acomp_request_set_dst_sg(9)
• acomp_request_set_dst_dma(9)
• acomp_request_set_dst_nondma(9)
• acomp_request_set_dst_folio(9)
• crypto_acomp_compress(9)
• crypto_acomp_decompress(9)

and yeah, acomp_request_alloc_extra(9) shows up twice in the list. that's not me being sloppy, that's exactly how it is in the source. we keep the facts, always. 💅

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mwah 💜 that's the whole page! this gem lives in ./include/crypto and the source/version stamp on it is dated October 2026 — so go forth, set your slen and your dlen, keep your hands off chain, and stan asynchronous (de)compression requests responsibly. 🧚⭐