sb_start_intwrite(9)

🌸 NAME 🌸

okay so this is sb_start_intwrite(9), straight from the Kernel API Manual 💖 Its whole job? get write access to a superblock for internal fs purposes. That's it, that's the iconic behavior ✨

✨ SYNOPSIS ✨

void sb_start_intwrite (struct super_block *sb );

🎀 ARGUMENTS 🎀

• sb — the super we write to 🫶

🦋 DESCRIPTION 🦋

This is the third level of protection against filesystem freezing, no cap. It's free for use by a filesystem. The only requirement, bestie, is that it must rank below sb_start_pagefault — that's the rule 💅

For example, a filesystem can call sb_start_intwrite when starting a transaction. That somewhat eases handling of freezing for internal sources of filesystem changes — say, internal fs threads, discarding preallocation on file close, etc. 🔥

💜 SEE ALSO 💜

• Kernel file ./include/linux/fs/super.h
• __sb_write_started(9)
• sb_write_started(9)
• sb_write_not_started(9)
• sb_end_write(9)
• sb_end_pagefault(9)
• sb_end_intwrite(9)
• sb_start_write(9)
• sb_start_pagefault(9)

cute sign-off: source/version is ./include/linux/fs, date is October 2026, and this page is sb_start_intwrite(9). stay slay, kernel bestie 🫶💖