gfs2_log_write(9)

✨ gfs2_log_write 💅

okay so bestie, welcome to the Kernel API Manual entry for gfs2_log_write(9) — this is a kernel function, a real one, and we're gonna get through it together, no cap 🫶

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🌸 NAME 🌸

gfs2_log_write — write to log ✍️

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🦋 SYNOPSIS 🦋

void gfs2_log_write (struct gfs2_sbd *sdp , struct gfs2_jdesc *jd ,
struct page *page , unsigned size , unsigned offset , u64 blkno ,
blk_opf_t opf );

like literally just copy that signature, do not touch it, it's perfect the way it is 💅

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🎀 ARGUMENTS 🎀

• sdp — the filesystem, the whole vibe holder 🌈
• jd — the journal descriptor (yes, the journal descriptor, lowkey important)
• page — the page we're writing, the main character of this operation 👑
• size — how much data we're writing, in case you were wondering
• offset — the offset within the page, iykyk, don't mix these two up
• blkno — block number of the log entry, the address basically
• opf — REQ_OP | op_flags, exactly like that, no notes

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💖 DESCRIPTION 💖

so here's the whole situation. it tries to add the page segment to the current bio — that's the dream, that's the goal, slay ✨

but if that fails? not me being dramatic, but we have a fallback plan fr fr. it submits the current bio to the device, creates a new one, and then adds the page segment to that new bio instead. iconic behavior honestly ��

so: try the current bio → if that doesn't work → submit it → make a new bio → add the segment to the new one. periodt 💀

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⭐ SEE ALSO ⭐

Kernel file ./fs/gfs2/lops.c — go read it, it's giving lore 🧚

and 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_bh(9)
• gfs2_log_write_page(9)
• gfs2_end_log_read(9)
• gfs2_jhead_folio_search(9)
• gfs2_jhead_process_page(9)
• gfs2_find_jhead(9)
• databuf_lo_before_commit(9)

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okay that's the whole page bestie, you ate that 🍓 and just so you know where all this came from: source is ./fs/gfs2, dated October 2026 — mwah, ily, go write some logs 💜🦋