bh_uptodate_or_lock(9)

💖 bh_uptodate_or_lock(9) 💖

okay bestie, welcome to the Kernel API Manual — this one is a tiny little function with main character energy ✨

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🌸 NAME 🌸

bh_uptodate_or_lock — literally the vibe check for whether the buffer is uptodate 💅

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✨ SYNOPSIS ✨

the signature is giving:

int bh_uptodate_or_lock (struct buffer_head *bh );

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🎀 ARGUMENTS 🎀

• bh — a struct buffer_head. that's the whole arg, bestie 🫶

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🦋 DESCRIPTION 🦋

okay so here's the tea: it returns true if the buffer is up-to-date, and false — with the buffer locked — if it's not. 😭

that locking detail is lowkey the main character here, so don't miss it, fr fr 💀

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🌈 SEE ALSO 🌈

Kernel file: ./fs/buffer.c — that's where the whole situation lives 👑

the related squad is:

• bio_endio_bh(9)
• 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_read(9)
• __bh_read_batch(9)

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mwah 💋 — with love from the ./fs source/version corner, dated October 2026, on page bh_uptodate_or_lock(9) 🎀🦋💖