blkcg_unpin_online(9)

💅 blkcg_unpin_online(9) — like, the kernel API manual, bestie

okay so real talk, this page lives in the Kernel API Manual (section 9, the fun one), and it's all about blkcg_unpin_online — one tiny function doing the most important cleanup chore in the whole blkcg friend group. let's get into it 🎀

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✨ NAME ✨

blkcg_unpin_online — unpin online state 🦋

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✨ SYNOPSIS ✨

void blkcg_unpin_online (struct cgroup_subsys_state *blkcg_css );

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✨ ARGUMENTS ✨

• blkcg_css — the blkcg of interest 💖 (yes, that's the whole description, it's giving minimal icon behavior)

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✨ DESCRIPTION ✨

so like, this one's basically a matching service for lifetimes, no cap 💅

It's primarily used to impedance-match blkg and cgwb lifetimes — which is a fancy way of saying it keeps their vibes in sync so that a blkg doesn't go offline while an associated cgwb is still out there being active and living its life 😭

And here's the main character moment: when this count goes to zero, that means all active cgwbs have finished ✅ so the blkcg can continue destruction by calling blkcg_destroy_blkgs. periodt. 🫶

no skipping ahead, bestie — the count hitting zero is the vibe check that says "we're clear, go ahead and clean up." 🌸

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✨ SEE ALSO ✨

Kernel file ./block/blk-cgroup.c 👑 and honestly the whole extended friend group:

• 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_pin_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)

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and that's the whole page, bestie — mwah 💋 it comes to you straight from ./block, dated October 2026, under the blkcg_unpin_online(9) banner. slay, bye! 🌈⭐