raid6_recov_datap(9)

hiii bestie 💖 you've landed on the raid6_recov_datap(9) page in the Kernel API Manual, and honestly? this one is a whole little recovery mission. no cap. 🫶

✨ NAME ✨

raid6_recov_datap — recover a missing data disk and missing P-parity

okay so that's the whole vibe: one function, one very specific rescue — recover a missing data disk and missing P-parity. 💅

🦋 SYNOPSIS 🦋

void raid6_recov_datap (int disks , size_t bytes , int faila , void **ptrs );

that's the exact signature, bestie — don't let the spacing jump-scare you. 😭

🎀 ARGUMENTS 🎀

• disks — number of "disks" to operate on including parity. yes, parity is included in this count. 🫶
• bytes — length in bytes of each vector. that's the size, in bytes, of each vector. ✨
• faila — failed data disk index. it tells you which data disk is the missing one. 💀
• ptrs — disks size array of memory pointers. literally an array of memory pointers sized by disks. 🎀

💅 DESCRIPTION 💅

so here's the mission: rebuild bytes of missing data in ptrs[faila], and rebuild the missing P-parity in ptrs[disks - 2], from the data in the remaining disks and the Q-parity pointed to by the other indices between 0 and disks - 1 in ptrs. and yes, disks includes the data disks and the two parities. periodt. ✨

🚨 caveat time, bestie: memory pointed to by each pointer in ptrs must be page aligned and is limited to PAGE_SIZE. that's not a suggestion, that's the rule. 😭

🔥 SEE ALSO 🔥

go poke these if you want the rest of the raid6 lore:

• Kernel file ./lib/raid/raid6/algos.c
• raid6_gen_syndrome(9)
• raid6_xor_syndrome(9)
• raid6_recov_2data(9)

mwah 💋 — source/version: ./lib/raid/raid6; date: October 2026; page: raid6_recov_datap(9). now go be page-aligned and iconic. 🎀