raid10_error(9)

💅 raid10_error(9) 💅

okay so this is a page from the Kernel API Manual, and honestly? it's a little baddie of a function that handles RAID10 drama. let's get into it 🫶

---

✨ NAME ✨

raid10_error — the RAID10 error handler, aka the friend who shows up when things go wrong 💀

---

🌸 SYNOPSIS 🌸

void raid10_error (struct mddev *mddev , struct md_rdev *rdev );

---

🎀 ARGUMENTS 🎀

• mddev — the affected md device. yes, the whole vibe of the array rides on this one 🫶
• rdev — the member device to fail. sorry bestie, you're getting voted off the island 🙈

---

💖 DESCRIPTION 💖

so the routine acknowledges that rdev failed and then figures out the new mddev state. main character decision-making energy, honestly. and if it actually failed, then:

• the MD_BROKEN flag gets set in mddev->flags. 💀
• otherwise, it must be degraded, which means:
  • recovery is interrupted. 😭
  • mddev->degraded is bumped. ⬆️

rdev is marked as Faulty — with one exception, and this is the iykyk part: that doesn't happen when the array is failed and MD_FAILLAST_DEV is not set. so clock that ⭐

---

🦋 SEE ALSO 🦋

• Kernel file ./drivers/md/raid10.c — go read it, it's giving source of truth ✨

---

and that's the whole page, no cap 🌈 go off and handle those errors, bestie 💜

sign-off szn 🎀: this lil gem lives under ./drivers/md, and it's dated October 2026 — iconic, timeless, periodt 💅