gfs2_find_jhead(9)

✨ gfs2_find_jhead — Kernel API Manual ✨

okay so bestie, welcome to the gfs2_find_jhead(9) page 💖 this one's a little kernel function that goes hunting for the head of a log, and honestly? it's giving main character energy 🎀

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🌸 NAME 🌸

gfs2_find_jhead — find the head of a log 💅

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🦋 SYNOPSIS 🦋

int gfs2_find_jhead (struct gfs2_jdesc *jd , struct gfs2_log_header_host
*head );

like, that's the whole signature, no cap ✨

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🎀 ARGUMENTS 🎀

• jd — the journal descriptor 👑 this is the journal we're poking at
• head — the log descriptor for the head of the log is returned here 🫶 so this is where the answer lands

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💜 DESCRIPTION 💜

so what it actually does: it does a search of a journal by reading it in large chunks using bios 🔥 and then it finds the valid log entry with the highest sequence number — i.e. the log head 💅 that's the vibe check, that's the whole quest 🌈

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⭐ RETURN ⭐

0 on success, errno otherwise 😭 (classic kernel behaviour, iykyk)

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🧚 SEE ALSO 🧚

kernel file ./fs/gfs2/lops.c, plus the whole friend group:

• gfs2_pin(9)
• gfs2_unpin(9)
• gfs2_end_log_write_bh(9)
• gfs2_end_log_write(9)
• gfs2_log_submit_write(9)
• gfs2_log_alloc_bio(9)
• gfs2_log_get_bio(9)
• gfs2_log_write(9)
• gfs2_log_write_bh(9)
• gfs2_log_write_page(9)
• gfs2_end_log_read(9)
• gfs2_jhead_folio_search(9)
• gfs2_jhead_process_page(9)
• databuf_lo_before_commit(9)

like, go read the whole squad fr fr 📚✨

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ngl this page is short but it ate 💅 everything above is exactly what the manpage says — no extra lore, no invented behaviour, periodt 💖

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and that's a wrap bestie 🎀 this one came out of the ./fs/gfs2 corner of the kernel world, dated October 2026, and it's living its best life in the Kernel API Manual ✨🦋 slay, go find that log head 👑💜