vdo_share_c...d_write_lock(9)

📦 version 7.3.1, in nixpkgs unstable

💅 vdo_share_compressed_write_lock(9) — Kernel API Manual ✨

okay so bestie, welcome to the Kernel API Manual 🎀 — this one's from the dm-vdo crew and it's literally the glow-up moment for a lock. buckle up 🦋

🌸 NAME 🌸

vdo_share_compressed_write_lock — the function that takes a data_vio's hash lock and makes it a shared holder of the PBN lock on the compressed block its data just got written to. yes queen, it's upgrading the vibes from exclusive to shared 💖

⭐ SYNOPSIS ⭐

void vdo_share_compressed_write_lock (struct data_vio *data_vio , struct
pbn_lock *pbn_lock );

that's it, that's the whole signature, no cap 🫶

🦋 ARGUMENTS 🦋

  • data_vio — the data_vio that just got compressed. main character energy, honestly 🧚
  • pbn_lock — the PBN lock sitting on that compressed block. the other half of the duo 💜

👑 DESCRIPTION 👑

so here's the tea ☕ — if the lock is still a write lock (and ngl, it will be, if this is the first share), it gets converted into a read lock. slay. ✨

this also reserves a reference count increment for the data_vio. so like, it's not just changing the lock type, it's also calling dibs on a refcount bump. periodt 💅

🔥 SEE ALSO 🔥

the whole friend group, fr fr — go say hi to:

like, the entire dedupe.c cast 😭 go read them all, iykyk 💀

and that's the page, bestie 💖 this lil icon lives in ./drivers/md/dm-vdo, dated October 2026, and the header gets truncated to vdo_share_c...d_write_lock(9) because even manpage titles deserve a little mystery 🙈 see u in the next one 🌈⭐🍓

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