bio_endio_bh(9)

💅 bio_endio_bh(9)

okay so bestie, we're in the Kernel API Manual today and this lil function is called bio_endio_bh — literally the cleanup crew for a bio you used to submit a buffer. she's giving "you started this, now finish it" energy ✨

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🌸 SYNOPSIS 🌸

bool bio_endio_bh (struct bio *bio , struct buffer_head **bhp );

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🎀 ARGUMENTS 🎀

• bio — the bio. that's her. that's the girl.
• bhp — where to return the buffer_head. like, the drop-off address for your buffer head 🫶

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🦋 DESCRIPTION 🦋

so here's the vibe: you call this inside your bio_end_io handler to retrieve the buffer_head that got submitted in bh_submit. that's the whole point of her 💖

⚠️ ok but listen — if you did not call bh_submit, do not call this function. it will return garbage. like, actual literal garbage, not a cute vibe, not a metaphor, just garbage 💀

also important, ngl: this function consumes the bio refcount, which will probably free the bio. so yeah, she eats the refcount and the bio is likely gone after. main character behavior, honestly 👑

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🔥 RETURN 🔥

• True if the I/O succeeded. slay 💅

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🌈 SEE ALSO 🌈

kernel file ./fs/buffer.c plus the whole friend group:

• end_buffer_read_sync(9)
• bh_end_read(9)
• bh_end_write(9)
• bh_end_async_write(9)
• mmb_sync(9)
• block_dirty_folio(9)
• mark_buffer_dirty(9)
• __brelse(9)
• __bforget(9)
• bh_submit(9)
• bdev_getblk(9)
• __bread_gfp(9)
• block_invalidate_folio(9)
• clean_bdev_aliases(9)
• try_to_free_buffers(9)
• bh_uptodate_or_lock(9)
• __bh_read(9)
• __bh_read_batch(9)

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okay that's the whole page bestie, ily, go free those bios responsibly 🧚‍♀️💜

signed off from the ./fs directory — October 2026 edition, bio_endio_bh(9), periodt. 🎀