nd_pfn_validate(9)

💅 nd_pfn_validate(9) 💅

okay so bestie, welcome to the Kernel API Manual — this one's a lil function from the kernel side of town, and honestly? she's short but she matters. let's get into it 🫶

---

✨ NAME ✨

nd_pfn_validate — read and validate info-block, that's literally the whole gig 💖

---

✨ SYNOPSIS ✨

int nd_pfn_validate (struct nd_pfn *nd_pfn , const char *sig );

like yes, that's the whole signature, no cap 🎀

---

✨ ARGUMENTS ✨

• nd_pfn — the fsdax namespace runtime state / properties, aka where all the vibes live 🌸
• sig — this one's just… here. the manpage gives it zero description, so i'm not gonna invent one for you, bestie 🙈 (i'm not gonna make stuff up, that's not the move)

---

✨ DESCRIPTION ✨

okay so here's the tea ☕ and it's actually important:

once this function returns, the info-block buffer contents (->pfn_sb) are indeterminate if validation fails. so like… don't go reading that buffer after a fail, it's giving 🍓 chaos, it's giving undefined vibes, okay?? 😭

but if validation succeeds? then you get a coherent info-block. slay. that's it, that's the contract 💅

fr fr, remember the failure case — ->pfn_sb is indeterminate on validation failure, coherent otherwise. that's the whole personality of this function 🦋

---

✨ SEE ALSO ✨

Kernel file ./drivers/nvdimm/pfn_devs.c — go read the source, iykyk 👑

---

and that's the whole page!! 🌈 this one was written under ./drivers/nvdimm, dated October 2026, and it's part of the Kernel API Manual — mwah, bye bestie, go validate some info-blocks ✨💜🎀