STRUCT BIO_VEC(9)

📦 version 7.3.1, in nixpkgs unstable

🌸 struct bio_vec(9) 🌸

okay so bestie, you're in the Kernel API Manual and today's main character is struct bio_vec — literally just a contiguous range of physical memory addresses. that's it, that's the vibe. 💅

✨ SYNOPSIS ✨

like, here's the whole entire struct, no cap:

struct bio_vec {
    struct page     *bv_page;
    unsigned int    bv_len;
    unsigned int    bv_offset;
 };

she's small. she's iconic. she has three fields and zero drama. 🎀

🦋 Members 🦋

  • bv_page — the first page associated with the address range. like the head of the friend group, everyone else follows her. 💖
  • bv_len — how many bytes are in the address range. the length. the amount. the whole measurement situation. ✨
  • bv_offset — where the address range starts, relative to the start of bv_page. so like, an offset from the beginning of bv_page, iykyk. 🫶

🔥 Description 🔥

okay so this is the part that actually slaps — all the pages within a bio_vec, starting from bv_page, are contiguous, meaning you can simply iterate over them. no jumping around, no hunting, no "where did that page go" energy. just vibes and a straight walk through memory. the manpage literally says to see bvec_advance for that iteration moment. ⭐

so yeah: contiguous pages, simple iteration, bvec_advance does the little walk. periodt. 👑

🌈 SEE ALSO 🌈

the kernel file ./include/linux/bvec.h and her whole bestie lineup:

go read all of them, bestie, they're all so good. 💜

fr fr, only contiguous ranges allowed in here. that's the whole point. don't come in here with scattered pages, it's giving chaos and we don't do chaos. 🙈

and that's the whole page!! 🎀 brought to you by ./include/linux — October 2026 — shoutout to the source and the date, mwah, slay, bye bestie 💖💅✨

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