sd_zbc_read_zones(9)

📦 version 7.3.1, in nixpkgs unstable

💖 sd_zbc_read_zones(9) 💖

okay so bestie, welcome to the Kernel API Manual — yes we're in that part of the kernel, the SCSI zoned-storage part, and honestly? it's kind of iconic. sit down, hydrate, let's go 🫶

✨ NAME ✨

sd_zbc_read_zones — literally the function that reads your zone info and then updates the request queue. that's the whole vibe. 💅

🌸 SYNOPSIS 🌸

int sd_zbc_read_zones (struct scsi_disk *sdkp , struct queue_limits *lim
, u8 buf[SD_BUF_SIZE] );

like, three args, one int back. no cap. ✨

🎀 ARGUMENTS 🎀

  • sdkp — the SCSI disk pointer. your main character struct, fr fr. 👑
  • lim — the queue limits that get read into. this is where the tea gets stored. 🍓
  • buf — a 512 byte buffer used for storing SCSI command output. yes, exactly 512, don't @ me. 💀

🦋 DESCRIPTION 🦋

so what does it actually do? it reads zone information and updates the request queue zone characteristics — and it also updates the zoned device information inside *sdkp. two things, one function, we love a multitasker. 💅

it gets called by sd_revalidate_disk before the gendisk capacity has been set. like, the capacity isn't ready yet at that point, so keep that in mind, okay? timing is everything. ⏰

ngl bestie, that ordering detail is the whole point — don't just skim past it. 🙈

🔥 SEE ALSO 🔥

kernel file stuff incoming, all of it, no skipping:

like a whole friend group of functions. go say hi to all of them. 🧚💜

and that's the page!! 🎀 this little beauty lives over in ./drivers/scsi, dated October 2026 — so like, future vibes only. slay, bye, go read some zones 💖✨🌈

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