sd_group_number(9)

📦 version 7.3.1, in nixpkgs unstable

🎀 sd_group_number(9) — like, the kernel API manual, bestie 🎀

okay so first things first: this is a page from the Kernel API Manual, section 9, and the function it's hyping up is called sd_group_number. Buckle up buttercup, it's a short one but it's iconic 💅

✨ NAME ✨

sd_group_number — literally just computes the GROUP NUMBER field. that's it. that's the whole job 🫶

🌸 SYNOPSIS 🌸

u8 sd_group_number (struct scsi_cmnd *cmd );

yes bestie, it returns a u8, and yes, it takes exactly one argument. no plot twist 🦋

💖 ARGUMENTS 💖

  • cmd — the SCSI command you're handing over, aka the thing you want the value of the six-bit GROUP NUMBER field computed for. six bits. tiny but mighty ✨

👑 DESCRIPTION 👑

okay so here's the tea, straight from SBC-5 r05, and I'm citing my source because I'm a scholar:

https://www.t10.org/cgi-bin/ac.pl?t=ff=sbc5r05.pdf

the GROUP NUMBER field maps to relative lifetimes like this 🌈:

  • 0 — no relative lifetime. like, none. zero. the void 💀
  • 1 — shortest relative lifetime ⚡
  • 2 — second shortest relative lifetime 🍓
  • 3 – 0x3d — intermediate relative lifetimes, the whole mushy middle, the group chat of values 🫶
  • 0x3e — second longest relative lifetime 🌸
  • 0x3f — longest relative lifetime, the final boss, main character energy 👑

that's the entire mapping. no cap. 🧚

🔥 SEE ALSO 🔥

the kernel file lives at ./drivers/scsi/sd.c, and honestly the whole friend group shows up here:

go read all of them, i'll wait 💜

and that's the page!! sign-off time: this lil masterpiece comes to you from the ./drivers/scsi directory, dated October 2026, and it's giving Kernel API Manual realness. slay, bye 💅✨🎀

📦 where this page comes from