cgroup_v1v2_get_from_file(9)

okay so bestie, this is cgroup_v1v2_get_from_file(9) from the Kernel API Manual 💖 it's a whole little function, and we're gonna get you comfy with it ✨

💖 NAME 💖

cgroup_v1v2_get_from_file — get a cgroup pointer from a file pointer 🫶

✨ SYNOPSIS ✨

struct cgroup * cgroup_v1v2_get_from_file (struct file *f );

🎀 ARGUMENTS 🎀

• f — the file corresponding to cgroup_dir. That's the whole assignment, bestie 💅

🦋 DESCRIPTION 🦋

Find the cgroup from a file pointer associated with a cgroup directory. Slay ✨

Returns a pointer to the cgroup on success. If the cgroup cannot be found, ERR_PTR is returned. No cap, that's the whole vibe 💀

🌈 SEE ALSO 🌈

Kernel file ./kernel/cgroup/cgroup.c — plus the whole cgroup bestie squad:

• cgroup_ssid_enabled(9), cgroup_on_dfl(9), cgroup_e_css_by_mask(9), cgroup_e_css(9), cgroup_get_e_css(9), __cgroup_task_count(9), cgroup_task_count(9)
• for_each_css(9), do_each_subsys_mask(9), css_set_populated(9), css_update_populated(9), css_set_update_populated(9)
• css_set_move_task(9), compare_css_sets(9), find_existing_css_set(9), allocate_cgrp_cset_links(9), link_css_set(9), find_css_set(9)
• cgroup_file_mode(9), cgroup_calc_subtree_ss_mask(9), cgroup_kn_unlock(9), cgroup_kn_lock_live(9), css_clear_dir(9)
• css_populate_dir(9), cgroup_attach_lock(9), cgroup_attach_unlock(9), cgroup_migrate_add_task(9), cgroup_taskset_first(9)
• cgroup_taskset_next(9), cgroup_migrate_execute(9), cgroup_migrate_vet_dst(9), cgroup_migrate_finish(9), cgroup_migrate_add_src(9), cgroup_migrate_prepare_dst(9)
• cgroup_migrate(9), cgroup_attach_task(9), cgroup_update_dfl_csses(9), cgroup_lock_and_drain_offline(9), cgroup_save_control(9)
• cgroup_propagate_control(9), cgroup_restore_control(9), cgroup_apply_control_enable(9), cgroup_apply_control_disable(9), cgroup_apply_control(9), cgroup_finalize_control(9)
• cgroup_enable_threaded(9), cgroup_tryget_css(9), cgroup_addrm_files(9), cgroup_rm_cftypes(9), cgroup_add_cftypes(9), cgroup_add_dfl_cftypes(9)
• cgroup_add_legacy_cftypes(9), cgroup_file_notify(9), cgroup_file_show(9), css_next_child(9), css_next_descendant_pre(9)
• css_rightmost_descendant(9), css_next_descendant_post(9), css_has_online_children(9), css_task_iter_advance_css_set(9), css_task_iter_start(9)
• css_task_iter_next(9), css_task_iter_end(9), css_create(9), kill_css_sync(9), kill_css_finish(9), cgroup_destroy_locked(9)
• cgroup_init_early(9), cgroup_init(9), cgroup_fork(9), cgroup_get_from_file(9), cgroup_css_set_fork(9), cgroup_css_set_put_fork(9)
• cgroup_can_fork(9), cgroup_cancel_fork(9), cgroup_post_fork(9), cgroup_task_exit(9), css_tryget_online_from_dir(9), css_from_id(9)
• cgroup_get_from_path(9), cgroup_v1v2_get_from_fd(9), cgroup_get_from_fd(9), cgroup_parse_float(9)

and that's the page, bestie 🫶 this one's from source/version ./kernel/cgroup, dated October 2026 💜✨