vfsuid_has_fsmapping(9)

💅 vfsuid_has_fsmapping(9) — Kernel API Manual 🌸

okay so bestie, welcome to the vfsuid_has_fsmapping(9) page in the Kernel API Manual. We're checking whether a vfsuid maps into the filesystem — tiny function, big "do I belong here?" energy. 🫶

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✨ NAME ✨

vfsuid_has_fsmapping — check whether a vfsuid maps into the filesystem 💫

🌈 SYNOPSIS 🌈

bool vfsuid_has_fsmapping (struct mnt_idmap *idmap , struct
user_namespace *fs_userns , vfsuid_t vfsuid );

That's the whole iconic signature, no cap. 📜

🎀 ARGUMENTS 🎀

• idmap — the mount's idmapping. 🗺️
• fs_userns — the filesystem's idmapping. 🗂️
• vfsuid — the vfsuid to be mapped. 💌

🦋 DESCRIPTION 🦋

Okay so the actual job: check whether vfsuid has a mapping in the filesystem idmapping. Use this function to check whether the filesystem idmapping has a mapping for vfsuid. That's the whole quest, bestie. ✨

🔥 RETURN 🔥

• true — if vfsuid has a mapping in the filesystem. ✅
• false — if not. ❌

👑 SEE ALSO 👑

Kernel file: ./include/linux/mnt_idmapping.h — go look, iykyk. 🌈

The whole squad:

• vfsuid_eq_kuid(9)
• vfsgid_eq_kgid(9)
• vfsuid_into_kuid(9)
• vfsgid_has_fsmapping(9)
• vfsgid_into_kgid(9)
• mapped_fsuid(9)
• mapped_fsgid(9)

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xoxo, this page came from ./include/linux, dated October 2026, and it's living under the vfsuid_has_fsmapping(9) version tag. periodt 💅✨💖