from_vfsgid(9)

🌸 from_vfsgid(9) — Kernel API Manual 🌸

okay bestie, welcome to the from_vfsgid(9) glow-up ✨ this is a kernel API page, and we’re gonna keep every detail cute and correct. 💅

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🎀 NAME 🎀

from_vfsgid — map a vfsgid into the filesystem idmapping.

✨ SYNOPSIS ✨

here’s the signature, verbatim, bestie:

kgid_t from_vfsgid (struct mnt_idmap *idmap , struct user_namespace
*fs_userns , vfsgid_t vfsgid );

🦋 ARGUMENTS 🦋

• idmap — the mount's idmapping.
• fs_userns — the filesystem's idmapping.
• vfsgid — the vfsgid to be mapped.

💖 DESCRIPTION 💖

Map vfsgid into the filesystem idmapping. This function has to be used in order to e.g. write vfsgid to inode->i_gid. Like, that’s the assignment, and it ate. 🔥

bestie note: the page literally says has to be used for that inode->i_gid write — so yeah, it’s required, no cap.

👑 RETURN 👑

vfsgid mapped into the filesystem idmapping. That’s the return value, babes. 🫶

🌈 SEE ALSO 🌈

• Kernel file ./fs/mnt_idmapping.c
• initial_idmapping(9)
• make_vfsuid(9)
• make_vfsgid(9)
• from_vfsuid(9)
• vfsgid_in_group_p(9)
• mnt_idmap_get(9)
• mnt_idmap_put(9)

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mwah 💋 source/version: ./fs · date: October 2026 — periodt, that’s the whole page, bestie 💖