blkg_rwstat_add(9)

💅 blkg_rwstat_add — from the Kernel API Manual, bestie ✨

Okay so real talk, this one's a little kernel function called blkg_rwstat_add, and it lives in the Kernel API Manual. Think of it as the glow-up your block-cgroup stats deserve 💖

🌸 NAME 🌸

blkg_rwstat_add — literally just adds a value to a blkg_rwstat. That's the whole vibe. No cap 🫶

✨ SYNOPSIS ✨

void blkg_rwstat_add (struct blkg_rwstat *rwstat , blk_opf_t opf ,
uint64_t val );

🎀 ARGUMENTS 🎀

• rwstat — the target blkg_rwstat, aka the thing getting the add. Main character energy 👑
• opf — the REQ_OP plus flags. It's giving "which counter are we even talking about" 😌
• val — the value you're adding. The actual number, the moment, the whole point 💅

💜 DESCRIPTION 💜

So you take val and you add it to rwstat. Simple. Iconic. The counters get chosen according to rw — yes, that's what the docs say, don't come for me 🙈 — and the way that works is the whole reason opf is sitting there with its flags.

⚠️ Big heads-up bestie: the caller is responsible for synchronizing calls to this function. Like, you. Not the function. It will not save you. Lock it down yourself or things get messy 😭🔒

🦋 SEE ALSO 🦋

Kernel file ./block/blk-cgroup-rwstat.h — and honestly the whole friend group:

• blkg_rwstat_read(9)
• blkg_rwstat_total(9)
• blkg_rwstat_reset(9)
• blkg_rwstat_add_aux(9)

That's the page, gorgeous 💫 it ships from ./block, dated October 2026, and the version tag is blkg_rwstat_add(9) — go forth and add your values, synchronized and slaying 🌈⭐