bio_add_max_vecs(9)

💖 bio_add_max_vecs — honestly my fave little helper 💖

okay so real talk, this one lives in the Kernel API Manual, section 9, and it's literally the "how many bio_vecs do I need" girlie. no cap. ✨

---

🌸 NAME 🌸

bio_add_max_vecs — it tells you the number of bio_vecs needed to add data to a bio. bestie, that's the whole personality 🎀

---

✨ SYNOPSIS ✨

unsigned int bio_add_max_vecs (void *kaddr , unsigned int len );

like. that's it. two args. she's low maintenance 💅

---

🦋 ARGUMENTS 🦋

• kaddr — the kernel virtual address you're adding. that's the vibe, that's the starting point 🫶
• len — the length, in bytes, that you wanna add. numbers girlie. we love her 📏

---

🔥 DESCRIPTION 🔥

okay so here's what's happening: this function calculates how many bio_vecs need to be allocated so you can add the kernel virtual address range in [kaddr:len] in the worst case. yes, worst case — she's planning ahead, she's the friend who brings an extra charger, she's prepared 💀✨

literally it's just a count. but like. an iconic count. no guessing, no vibes-based math, just: how many vecs, bestie. 🧚

---

🌈 SEE ALSO 🌈

the whole friend group, fr fr — all of these are chillin' in the kernel file ./include/linux/bio.h:

• bio_advance(9)
• struct folio_iter(9)
• bio_for_each_folio_all(9)
• bio_next_split(9)
• bio_in_atomic(9)
• bio_complete_in_task(9)
• bio_endio_status(9)
• bio_iov_bounce_nr_vecs(9)
• bio_is_zone_append(9)

go say hi, they're all super sweet i promise 😭💜

---

quick heads up: the worst-case thing is not a glitch, it's the whole point. she's giving "pack for the worst weather" main character energy, so don't @ me when the number looks big 🌸

---

and that's the page!! sourced from ./include/linux, dated October 2026, and it's part of the Kernel API Manual — mwah, tysm for reading, ily, slay 🎀💖👑