blkcg_pin_online(9)

💅 blkcg_pin_online(9) — the Kernel API Manual, but make it make sense ✨

okay so bestie, this one lives in the Kernel API Manual and it's called blkcg_pin_online — say that five times fast, I dare you 😭 it's short, it's sweet, it does exactly one thing and it does it iconically.

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✨ NAME ✨

blkcg_pin_online — pin online state 🎀

like, literally the whole personality of this function is "keep the online state pinned." that's the vibe. no cap.

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🦋 SYNOPSIS 🦋

void blkcg_pin_online (struct cgroup_subsys_state *blkcg_css );

not me giving you the whole signature verbatim because we do not paraphrase code around here 💀 it returns void, so nothing comes back, it just does the thing.

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🌸 ARGUMENTS 🌸

• blkcg_css — the blkcg of interest 🫶 this is the one you're pointing at, the main character of this whole operation.

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💖 DESCRIPTION 💖

okay so here's the tea ☕ — while a blkcg is pinned</>, it's kept online. that's it. that's the function. she's simple, she's effective, she slays.

the way that this is primarily used is to impedance-match blkg and cgwb lifetimes — which lowkey sounds like a physics class but it's really just making sure their lifetimes line up so that a blkg doesn't go offline while an associated cgwb is still active. like bestie, we are NOT letting blkg dip out while cgwb is still on the dance floor 🕺💀

it's giving chaperone energy. it's giving "nobody leaves until everybody leaves." highkey iconic.

⚠️ quick vibe check: this keeps the blkcg online — it does not describe anything beyond that, so don't go reading extra lore into it, mwah 💋

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🔥 SEE ALSO 🔥

okay this list is long and honestly it ate 👑

• Kernel file ./block/blk-cgroup.c
• blkcg_css(9)
• blkg_free(9)
• bio_blkcg_css(9)
• blkcg_parent(9)
• blkg_alloc(9)
• blkg_lookup_create(9)
• blkcg_print_blkgs(9)
• __blkg_prfill_u64(9)
• blkg_conf_init(9)
• blkg_conf_open_bdev(9)
• blkg_conf_prep(9)
• blkg_conf_unprep(9)
• blkg_conf_close_bdev(9)
• blkcg_destroy_blkgs(9)
• blkcg_unpin_online(9)
• blkcg_css_offline(9)
• blkcg_activate_policy(9)
• blkcg_deactivate_policy(9)
• blkcg_policy_register(9)
• blkcg_policy_unregister(9)
• blkcg_maybe_throttle_current(9)
• blkcg_schedule_throttle(9)
• blkcg_add_delay(9)
• blkg_tryget_closest(9)
• bio_associate_blkg_from_css(9)
• bio_associate_blkg(9)
• bio_clone_blkg_association(9)

like, blkcg_unpin_online(9) is right there in the list being the literal polar opposite of her — enemies to lovers arc fr fr 😭🫶

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and that's the whole page, bestie! 💜 this gem lives over in ./block and it's dated October 2026, so when you see blkcg_pin_online(9) glowing in your terminal, you'll know exactly who's keeping what online. slay, stay pinned, and don't forget to hydrate 🍓🧚✨