knfsd_fh_hash(9)

✨ knfsd_fh_hash ✨

okay so bestie, welcome to knfsd_fh_hash — it lives in section 9 of the Kernel API Manual, which is where all the kernel-function lore hangs out 🧚. this one's short and sweet and honestly a little iconic, so let's get into it 💅

---

🌸 NAME 🌸

knfsd_fh_hash — calculate the crc32 hash for the filehandle @fh — pointer to filehandle 🎀

like, that's the whole job. it hashes the filehandle. that's it. that's the girlboss moment 🔥

---

🦋 SYNOPSIS 🦋

u32 knfsd_fh_hash (const struct knfsd_fh *fh );

she takes one pointer and hands you back a u32. no cap, that's the entire signature, copy it exactly bestie 🫶

---

💖 ARGUMENTS 💖

• fh — undescribed 🙈

yeah. the manpage literally says -- undescribed -- for this one. not me staring at an empty description like 👁️👄👁️. so the official tea is: the docs don't describe it. (the NAME section does tell you it's a pointer to filehandle, so you're not totally stranded 🍓)

---

⭐ DESCRIPTION ⭐

so what does it actually do? it returns a crc32 hash for the filehandle — says so right there in the NAME section too, calculate the crc32 hash for the filehandle 💫

and here's the fun part, the lil flex: that hash is compatible with the one displayed by "wireshark" 🔥🔥 so if you're eyeballing a filehandle hash in wireshark and need the exact same number from inside the kernel, this is the function that matches it. vibe check passed, output aligned, periodt 👑

just to be super clear bc accuracy is cute: the page doesn't say how it computes anything beyond "crc32", and it doesn't promise behaviour outside of "compatible with wireshark." don't go inventing extra promises, bestie 😭

---

🎀 SEE ALSO 🎀

• Kernel file ./fs/nfsd/nfsfh.h — the header where all this lives 📁
• fh_want_write(9)
• fh_drop_write(9)
• fh_clear_pre_post_attrs(9)

go read those if you want the full nfsfh.h cinematic universe 🌈

---

👑 the sign-off 👑

this little masterpiece comes to you from ./fs/nfsd (that's the source/version, bestie, in all its path-shaped glory), dated October 2026, and it answers to the name knfsd_fh_hash(9) 💜

k that's the whole page — short, chaotic, extremely on brand. go hash a filehandle and slay 💅✨🌸