jbd2_journal_flush(9)

📦 version 7.3.1, in nixpkgs unstable

💅 jbd2_journal_flush(9) 💅

okay so bestie, welcome to the jbd2_journal_flush(9) page — that's the kernel API manual vibe, and honestly? it's a good one. sit down, grab a strawberry 🍓, and let's get into it.

✨ NAME ✨

jbd2_journal_flush — Flush journal. that's it, that's the whole name. iconic, concise, no notes. 👑

🦋 SYNOPSIS 🦋

int jbd2_journal_flush (journal_t *journal , unsigned int flags );

like, look at her. two args, returns an int. main character energy fr fr. 🌈

🎀 ARGUMENTS 🎀

  • journal — the journal you're acting on. that's your girl. the journal_t * you're flushing. 💖
  • flags — optional operation on the journal blocks after the flush (see below 👇). yes, "after". order matters, bestie.

🔥 DESCRIPTION 🔥

so what does she actually do? she flushes all data for a given journal to disk and then empties the journal. like a full reset of the vibe check on that journal. ✨

filesystems can use this when they're remounting readonly — the whole point is to make sure that recovery does not need to happen on remount. no surprise recoveries, no drama, we're not doing that today. 🙈

and optionally, you can have a discard or a zeroout issued on the journal blocks after flushing. your choice, your moment.

now the flags themselves, because these are the actual keys to the kingdom:

  • JBD2_JOURNAL_FLUSH_DISCARD — issues discards for the journal blocks 🔥
  • JBD2_JOURNAL_FLUSH_ZEROOUT — issues zeroouts for the journal blocks 🌸

that's the whole flag menu. two options. both slay. pick your fighter. 💅

👑 SEE ALSO 👑

kernel file ./fs/jbd2/journal.c — and honestly the whole friend group shows up here, so let me list every single one because I refuse to leave anyone out 🫶:

the whole squad. no cap. 💜

aaaand that's the page!! 🎀 this one came from ./fs/jbd2, dated October 2026, and it's literally titled jbd2_journal_flush(9) — so if you forget what you just read, the header and the footer both have you covered. mwah 💋✨

📦 where this page comes from