blkcg_destroy_blkgs(9)

💖 NAME 💖

okay bestie, welcome to the blkcg_destroy_blkgs(9) page from the Kernel API Manual ✨ This function is literally responsible for shooting down blkgs — that’s the whole NAME vibe 🎯💅

🌸 SYNOPSIS 🌸

void blkcg_destroy_blkgs (struct blkcg *blkcg );

🎀 ARGUMENTS 🎀

• blkcg — the blkcg of interest, aka the one you’re looking at 👀💖

🦋 DESCRIPTION 🦋

so here’s the tea: blkgs should be removed while holding both q and blkcg locks 🔒🔒. and because the blkcg lock is nested inside the q lock, this function performs reverse double lock dancing 💃🕺 — yes, that’s the actual phrase, and it’s iconic.

Destroying the blkgs releases the reference held on the blkcg’s css, allowing blkcg_css_free to eventually be called ✨ chain reaction, but make it kernel 🧚💜

this is the blkcg counterpart of ioc_release_fn 🫶

🔥 SEE ALSO 🔥

Kernel file ./block/blk-cgroup.c is the home base for all this 🏠 and here’s the whole 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_pin_online(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)

that’s the whole page, bestie 💅 sending u a kiss from ./block, dated October 2026, for blkcg_destroy_blkgs(9) — mwah 💋🎀