wbc_init_bio(9)

💖 wbc_init_bio(9) — the kernel API glow-up 🎀

okay so bestie, welcome to the Kernel API Manual ✨ this one's a little function with big main-character energy and honestly it's giving "quiet but essential," yknow? let's get into it 🦋

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🌸 NAME 🌸

wbc_init_bio — writeback-specific initialization of a bio 💅

like, it's the little pre-flight ritual before a bio goes off to do writeback things ✨

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⭐ SYNOPSIS ⭐

void wbc_init_bio (struct writeback_control *wbc , struct bio *bio );

no cap, that's the whole signature 🫶 returns void, so don't go looking for a return value, she doesn't have one 💀

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🎀 ARGUMENTS 🎀

• wbc — the writeback_control for the writeback that's currently in progress. literally the vibe manager for this whole operation 👑
• bio — the bio that's about to be initialized. this is the one getting the glow-up 🧚

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💖 DESCRIPTION 💖

so here's the tea ☕ — bio is a part of the writeback that's in progress, and that writeback is controlled by wbc. they're a package deal, iykyk 💜

wbc_init_bio performs the writeback-specific initialization on it. and why do we care?? because this is what's used to apply the cgroup writeback context 🔥 that's the whole point, that's the moment, that's the slay ✨

⚠️ important bestie, don't skip this: it must be called after the bio has been associated with a device. like, order matters, that's the rule, periodt 💅

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🦋 SEE ALSO 🦋

• Kernel file ./include/linux/writeback.h
• wb_domain_size_changed(9)
• inode_attach_wb(9)
• inode_detach_wb(9)

go read those too, they're all in the same friend group fr fr 🫶

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and that's the whole page, bestie 💖 this icon lives in ./include/linux and this edition is dated October 2026 🌈 mwah, go init some bios responsibly 💅✨🎀