zfcp_ccw_set_online(9)

📦 version 7.3.1, in nixpkgs unstable

💅 zfcp_ccw_set_online(9) — from the Kernel API Manual, bestie 🎀

okay so this is a page from the Kernel API Manual, and it's all about zfcp_ccw_set_online — the little cutie that flips an fcp adapter to online. it's giving "glow-up button" energy and honestly? iconic. ✨

🌸 NAME 🌸

zfcp_ccw_set_online — literally the set_online function of the zfcp driver. that's the whole vibe. 💅

🦋 SYNOPSIS 🦋

int zfcp_ccw_set_online (struct ccw_device *cdev );

🎀 ARGUMENTS 🎀

  • cdev — pointer to the ccw device it belongs to 🫶 (yes bestie, it's its device, it's the whole relationship)

✨ DESCRIPTION ✨

okay so here's the tea: this function gets called by the common i/o layer, and what it does is set an adapter into state online. main character behaviour, no cap. 👑

and listen — the first call is the one that allocates all the adapter resources, and those resources stick around until the device gets removed via zfcp_ccw_remove. so like, don't expect them to wander off on their own, they're loyal fr fr. 💖

so what does setting an fcp device online actually mean? three things, and we're listing them because details matter:

  • it gets registered with the SCSI stack 🌈
  • the QDIO queues get set up ⭐
  • the adapter gets opened 🔥

three-for-three, we ate. 🍓

🧚 SEE ALSO 🧚

the Kernel file ./drivers/s390/scsi/zfcp_ccw.c — and the whole friend group:

iykyk, go read the rest of the squad. 📚💜

ngl bestie, that's the whole page — no hidden lore, no bug notes, no exit statuses, nothing lurking in the fine print. you got all of it. 😭🫶

okay that's a wrap!! this one lives in ./drivers/s390/scsi and it's dated October 2026, so go be your most online self, bestie — mwah 💋🎀✨

📦 where this page comes from