from_vfsuid(9)

🦋 NAME 🦋

from_vfsuid — map a vfsuid into the filesystem idmapping 💖 and yes bestie, this is from_vfsuid(9) from the Kernel API Manual, hi hi 🫶

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✨ SYNOPSIS ✨

okay so the whole vibe check is literally this:

kuid_t from_vfsuid (struct mnt_idmap *idmap , struct user_namespace
       *fs_userns , vfsuid_t vfsuid );

no cap, that's the signature 💅

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🎀 ARGUMENTS 🎀

• idmap — the mount's idmapping 🌸
• fs_userns — the filesystem's idmapping 🦋
• vfsuid — vfsuid to be mapped ✨

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💜 DESCRIPTION 💜

Map vfsuid into the filesystem idmapping. That's the assignment, periodt. This function has to be used in order to e.g. write vfsuid to inode->i_uid — like, that's the required move, not optional lore 😭🔥

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🌈 RETURN 🌈

vfsuid mapped into the filesystem idmapping ✨ — that's what comes back to you, bestie 🫶

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👑 SEE ALSO 👑

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

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cute sign-off time: this iconic little page comes from source/version ./fs, dated October 2026, and it's still from_vfsuid(9) — mwah 💋💖