jbd2_journal_shrink_scan(9)

📦 version 7.3.1, in nixpkgs unstable

💅 jbd2_journal_shrink_scan(9) 💅

okay bestie, welcome to the Kernel API Manual ✨ this one's a kernel-function page, lowercase-f function, capital-V Vibes 🦋

🌸 NAME 🌸

jbd2_journal_shrink_scan — and that's literally it, the description field is empty 💀 no further info, the manpage just trails off. Iconic of it honestly 🎀

✨ SYNOPSIS ✨

unsigned long jbd2_journal_shrink_scan (struct shrinker *shrink , struct
shrink_control *sc );

so it takes two pointers and hands you back an unsigned long, periodt 💅

🫶 ARGUMENTS 🫶

  • shrink — the shrinker you're working on, like the actual thing being shrunk 🧚
  • sc — the reclaim request to process, aka the to-do list you got handed 📋

🔥 DESCRIPTION 🔥

so what it does: it scans the checkpointed buffer on the checkpoint list, and releases the journal_head. that's the whole thing, no cap. scan it, free it, done 😭✨

👑 SEE ALSO 👑

this is the part where the page dumps the whole friend group on you, and honestly? slay. it's all in the kernel file ./fs/jbd2/journal.c:

and that's the tea 🍓 this lil page lives in ./fs/jbd2, dated October 2026, and it signs off as jbd2_journal_shrink_scan(9) — go read the source bestie, ily, bye 💖🌈

📦 where this page comes from