sb_write_not_started(9)

📦 version 7.3.1, in nixpkgs unstable

💅 sb_write_not_started(9) 💅

okay bestie, so this one is a kernel API manual page — yes, that Kernel API Manual — and it's literally the littlest vibe-check function you've ever seen. It answers one (1) question and then goes back to bed. Let's get into it 🫶

✨ NAME ✨

sb_write_not_started — checks if SB_FREEZE_WRITE is not held. that's it. that's the whole job. iconic honestly 👑

🌸 SYNOPSIS 🌸

bool sb_write_not_started (const struct super_block *sb );

like, you hand it a superblock and it hands you back a bool. a little transactional queen 🤝

🎀 ARGUMENTS 🎀

  • sb — the super we write to 💖 (yep, this is the superblock you're asking about, no cap)

🦋 DESCRIPTION 🦋

sooooo the function checks whether SB_FREEZE_WRITE is not held, and yeah — that's the entire plot.

⚠️ but bestie, important caveat, do not skip this: it may be a false positive with !CONFIG_LOCKDEP/LOCK_STATE_UNKNOWN. so if lockdep is off or the lock state is unknown, don't come for her, she did her best 😭

👑 SEE ALSO 👑

the kernel file ./include/linux/fs/super.h and all her siblings in the freeze-adjacent friend group — collect them all 🔥

honestly a whole squad, main character energy all around 💜

and that's the page, bestie! 🍓 this lil writeup lives in ./include/linux/fs and it's dated October 2026, so go forth, check your freeze state, and slay ✨🧚‍♀️

📦 where this page comes from