vfsgid_in_group_p(9)

💅 vfsgid_in_group_p(9) — from the Kernel API Manual, bestie ✨

Okay so this one's a little kernel helper, and yes the name is a whole mouthful — it's vfsgid_in_group_p, and the (9) just means it lives in that section of the manual, slay 🎀

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🌸 NAME 🌸

vfsgid_in_group_p — check whether a vfsuid matches the caller's groups 💖

(Yes, the NAME literally says vfsuid even though the function is about gids. That's what the page says, bestie — I'm not out here editing the lore, iykyk 🙈)

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✨ SYNOPSIS ✨

int vfsgid_in_group_p (vfsgid_t vfsgid );

That's it. One argument, one int back. Clean. Minimalist. Main character energy 👑

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🦋 ARGUMENTS 🦋

• vfsgid — the mnt gid to match 🍓 like, that's the thing you're handing over to get checked.

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💜 DESCRIPTION 💜

So the way this works: this function can be used to determine whether vfsuid matches any of the caller's groups. That's the whole vibe check — you pass in your mnt gid, it goes and looks at the caller's groups, and tells you if there's a match 💅

(And yeah, the description says vfsuid — same energy as the NAME. Keeping it exactly as the page wrote it, fr fr 🫶)

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🔥 RETURN 🔥

• 1 — yay, vfsuid matches the caller's groups ✅
• 0 — nope, no match 💀

Literally a yes-or-no, no in-between, periodt.

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🌈 SEE ALSO 🌈

Kernel file ./fs/mnt_idmapping.c, plus the whole friend group:

• initial_idmapping(9)
• make_vfsuid(9)
• make_vfsgid(9)
• from_vfsuid(9)
• from_vfsgid(9)
• mnt_idmap_get(9)
• mnt_idmap_put(9)

Go read those too, they're all lowkey iconic 👑

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Heads up bestie: the original page mixes vfsuid and vfsgid in the NAME, DESCRIPTION, and RETURN sections. I kept every word of it the way it was written — no cap, no fixing 💖

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And that's the whole page! 🧚 Signing off from ./fs, dated October 2026, on the vfsgid_in_group_p(9) page itself — stay hydrated, read your kernel headers, and mwah 💋💜