jbd2_mark_journal_empty(9)

📦 version 7.3.1, in nixpkgs unstable

💅 jbd2_mark_journal_empty(9) — a Kernel API Manual moment 🎀

okay so bestie, welcome to the Kernel API Manual ✨ and today's main character is literally a function that tells the whole filesystem "yeah the journal? empty. nothing in it. we're clean." iconic behavior tbh 🫶

🌸 NAME 🌸

jbd2_mark_journal_empty — Mark on disk journal as empty. no cap, that's the whole vibe 💖

✨ SYNOPSIS ✨

void jbd2_mark_journal_empty (journal_t *journal , blk_opf_t write_flags
);

it returns void btw — it does the thing and dips, no receipts 😌

🦋 ARGUMENTS 🦋

  • journal — The journal to update. this is the one getting the glow-up 💅
  • write_flags — Flags for the journal sb write operation. yk, the superblock write config 🎀

💜 DESCRIPTION 💜

so what does it actually do? it updates a journal's dynamic superblock fields to show that the journal is empty 🧚 lowkey important, highkey cute.

then it writes that updated superblock to disk, and — and this is the part that matters — it waits for IO to complete 😭 like it's not just fire-and-forget, it's committed to the bit. it sits there until the write actually lands. main character energy fr fr 💀✨

🌈 SEE ALSO 🌈

the source lives in the kernel file ./fs/jbd2/journal.c 🍓 and here's the whole friend group of sibling functions, all of them serving 💅:

bestie reminder: this page is filed under ./fs/jbd2, dated October 2026, and it's officially jbd2_mark_journal_empty(9) — iykyk 💖✨ go forth and mark things empty, queen 👑🦋
📦 where this page comes from