gfs2_log_get_bio(9)

📦 version 7.3.1, in nixpkgs unstable

💖 gfs2_log_get_bio(9) 💖

okay so bestie, welcome to the glow-up of the Kernel API Manual page for gfs2_log_get_bio — yes that's the man page name, and yes we're gonna get into it. this is the function that's like "hey, do we already have a bio lying around or do we need a fresh one?" and honestly? it's giving logistics queen. 🎀

✨ NAME ✨

gfs2_log_get_bio — get a cached log bio, or allocate a brand new one if there isn't one (fr fr, that's literally the whole vibe)

🌸 SYNOPSIS 🌸

struct bio * gfs2_log_get_bio (struct gfs2_sbd *sdp , u64 blkno , struct
bio **biop , blk_opf_t opf , bio_end_io_t *end_io , bool flush );

like look at that signature. six whole arguments. main character energy honestly 👑

🦋 ARGUMENTS 🦋

  • sdp — the super block. yeah, that super block. your fave. 💜
  • blkno — the device block number we're trying to write to, i.e. the destination. know where you're going, bestie.
  • biop — the bio to get or allocate. it's a double pointer so it can hand you back the bio it found or made.
  • opf — REQ_OP | op_flags. that's the operation and its flags, mashed together with a bitwise or. iconic combo.
  • end_io — the bi_end_io callback. the little function that gets called when the I/O finishes. the afterparty, if you will. 🎉
  • flush — always flush the current bio and allocate a new one? yes/no. simple as that. true means "nah we're done with the old one, gimme fresh". 🙈

⭐ DESCRIPTION ⭐

okay so here's the tea ☕:

if there is a cached bio, then we check whether the next block number is sequential with the previous one — and if it is, we just return it. easy. slay. 💅

but if it's not sequential? we flush the bio to the device. bye bestie, go write yourself to disk. 🦋

and if there's no cached bio at all, or we just flushed it in the previous step? then we allocate a new one. fresh bio, new era, periodt. ✨

🔥 RETURN 🔥

the bio to use for log writes. that's it. that's the return value. go write your log, queen. 👑

🌈 SEE ALSO 🌈

kernel file ./fs/gfs2/lops.c and also these absolute legends:

go read them. iykyk. 🫶

lowkey reminder that this whole page lives under ./fs/gfs2 in the kernel tree — that's the source, bestie, don't lose it 💀

and that's the page!! brought to you by the ./fs/gfs2 source, the October 2026 date, and the manual entry gfs2_log_get_bio(9) — mwah, drink water, and may all your bios be sequential 💖✨🎀

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