from_kqid_munged(9)

💅 from_kqid_munged(9) — kernel API manual, bestie edition ✨

okay so real talk, this page lives in the Kernel API Manual and it's about from_kqid_munged, and honestly? it's the chill, dependable one of the qid family. let's get into it 🫶

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✨ NAME ✨

from_kqid_munged — Create a qid from a kqid user-namespace pair.

like, that's the whole gig. one qid, one namespace, no drama 💅

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🎀 SYNOPSIS 🎀

qid_t from_kqid_munged (struct user_namespace *targ , struct kqid kqid
);

yep, that's the signature, copy it exactly, don't be weird about it ✨

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🦋 ARGUMENTS 🦋

• targ — The user namespace we want a qid in. literally "where do you want this qid delivered" energy 📦
• kqid — The kernel internal quota identifier to start with. this is the starting point, the raw material, the before picture 🌸

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🔥 DESCRIPTION 🔥

Map kqid into the user-namespace specified by targ and return the resulting qid. that's it, that's the mapping 🗺️

There is always a mapping into the initial user_namespace. so like, no matter what, the initial namespace always has your back 💖

Unlike from_kqid, from_kqid_munged never fails and always returns a valid projid. never fails. not once. not ever. it's giving unbothered icon behavior 👑 and honestly that's exactly why from_kqid_munged is appropriate for use in places where failing to provide a qid_t is not a good option — some call sites just cannot be doing the "oops no qid for you" thing 😭

If kqid has no mapping in targ, the kqid.type specific overflow identifier is returned. no cap, that's the fallback, and it's type-specific, so don't go assuming it's one universal magic number 🙈

nb bestie: "never fails" is the whole personality of this function. no error path, no NULL, just a valid projid, always. slay 💅

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🌈 SEE ALSO 🌈

• Kernel file ./fs/quota/kqid.c
• qid_eq(9)
• qid_lt(9)
• from_kqid(9)
• qid_valid(9)

go read the source, it's right there, iykyk 📖✨

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and that's the page!! sourced from ./fs/quota, dated October 2026, filed under from_kqid_munged(9) — mwah, go forth and munge those qids responsibly 🍓🧚💜