reserve_space(9)

📦 version 7.3.1, in nixpkgs unstable

💅 reserve_space — the Kernel API Manual one 🎀

okay bestie, welcome to reserve_space from the Kernel API Manual — yes it's a section 9 page, yes it's a kernel-internals moment, and yes it's giving "I live in fs/ubifs and I'm important" energy ✨

🌸 NAME 🌸

reserve_space — reserve space in the journal. periodt 💅

🦋 SYNOPSIS 🦋

int reserve_space (struct ubifs_info *c , int jhead , int len );

like, that's the whole signature. no cap. copy it exactly, don't @ me 🙈

🎀 ARGUMENTS 🎀

  • c — the UBIFS file-system description object 🗂️
  • jhead — the journal head number 🔢
  • len — the node length 📏

✨ DESCRIPTION ✨

So what does it do?? It reserves space in journal head head. 💖

If the reservation succeeded, the journal head stays locked — locked, bestie — and later has to be unlocked using … and then the source text just stops mid-sentence 😭 (that's genuinely how the page reads, I'm not gatekeeping anything from you, the manpage itself cuts off there).

On the failure side: and other negative error codes in case of other failures. 💀 that's the literal description, fr fr — negative error codes, "other" failures, that's what we've got.

⚠️ heads up: the DESCRIPTION text in this page is truncated in the original. I'm not gonna invent the missing chunk for you — no made-up function names, no fake behaviour, none of that. What's written above is what's actually there. 🙈

👑 SEE ALSO 👑

these are all in kernel file ./fs/ubifs/journal.c and they're the whole friend group 🫶:

like, that's the entire squad. read them, love them, cite them. ⭐

🌈 and that's the page 🌈

shoutout to ./fs/ubifs for bringing us here, and to October 2026 for the date on the tin 🎀 that's the source directory and the date, straight off the footer, no edits, iykyk 💜 stay hydrated, unlock your journal heads, bye bestie! 🦋🌸

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