bpf_cgroup_acquire(9)

🎀 bpf_cgroup_acquire(9) 🎀

okay so this is the Kernel API Manual page for bpf_cgroup_acquire, and it's giving “grab a cgroup reference but do NOT forget to clean up” energy ✨. Bestie, read the release note below, because leaving a ref hanging is not the vibe 💀.

✨ NAME ✨

bpf_cgroup_acquire — acquire a reference to a cgroup. A cgroup acquired by this kfunc which is not stored in a map as a kptr, must be released by calling bpf_cgroup_release().

No cap: if this kfunc hands you a cgroup and it is not stored in a map as a kptr, you must release it with bpf_cgroup_release(). Like, do not leave it on read, periodt 🫶.

🌸 SYNOPSIS 🌸

__bpf_kfunc struct cgroup * bpf_cgroup_acquire (struct cgroup *cgrp );

🦋 ARGUMENTS 🦋

• cgrp — the cgroup on which a reference is being acquired. That's the actual cgroup you're grabbing a ref on, iykyk.

💜 SEE ALSO 💜

Kernel file ./kernel/bpf/helpers.c is right there in the mix, and the whole squad is:

• bpf_obj_new(9)
• bpf_percpu_obj_new(9)
• bpf_obj_drop(9)
• bpf_percpu_obj_drop(9)
• bpf_refcount_acquire(9)
• bpf_list_push_front(9)
• bpf_list_push_back(9)
• bpf_rbtree_add(9)
• bpf_task_acquire(9)
• bpf_task_release(9)
• bpf_cgroup_release(9)
• bpf_cgroup_ancestor(9)
• bpf_cgroup_from_id(9)
• bpf_task_under_cgroup(9)
• bpf_task_get_cgroup1(9)
• bpf_task_from_pid(9)
• bpf_task_from_vpid(9)
• bpf_dynptr_slice(9)
• bpf_dynptr_slice_rdwr(9)
• bpf_dynptr_copy(9)
• bpf_dynptr_memset(9)
• bpf_iter_bits_new(9)
• bpf_iter_bits_next(9)
• bpf_iter_bits_destroy(9)
• bpf_copy_from_user_str(9)
• bpf_copy_from_user_task_str(9)
• bpf_strcmp(9)
• bpf_strcasecmp(9)
• bpf_strnchr(9)
• bpf_strchr(9)
• bpf_strchrnul(9)
• bpf_strrchr(9)
• bpf_strnlen(9)
• bpf_strlen(9)
• bpf_strspn(9)
• bpf_strcspn(9)
• bpf_strstr(9)
• bpf_strcasestr(9)
• bpf_strnstr(9)
• bpf_strncasestr(9)
• bpf_lookup_user_key(9)
• bpf_lookup_system_key(9)
• bpf_key_put(9)
• bpf_verify_pkcs7_signature(9)
• bpf_task_work_schedule_signal(9)
• bpf_task_work_schedule_resume(9)
• bpf_timer_cancel_async(9)

okay that's the page, bestie 🫶 this one is from source/version ./kernel/bpf, dated October 2026, and bpf_cgroup_acquire(9) is signing off 💅✨