/* * net/core/netclassid_cgroup.c Classid Cgroupfs Handling * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * Authors: Thomas Graf */ #include #include #include #include #include static inline struct cgroup_cls_state *css_cls_state(struct cgroup_subsys_state *css) { return css ? container_of(css, struct cgroup_cls_state, css) : NULL; } struct cgroup_cls_state *task_cls_state(struct task_struct *p) { return css_cls_state(task_css_check(p, net_cls_cgrp_id, rcu_read_lock_bh_held())); } EXPORT_SYMBOL_GPL(task_cls_state); static struct cgroup_subsys_state * cgrp_css_alloc(struct cgroup_subsys_state *parent_css) { struct cgroup_cls_state *cs; cs = kzalloc(sizeof(*cs), GFP_KERNEL); if (!cs) return ERR_PTR(-ENOMEM); return &cs->css; } static int cgrp_css_online(struct cgroup_subsys_state *css) { struct cgroup_cls_state *cs = css_cls_state(css); struct cgroup_cls_state *parent = css_cls_state(css->parent); if (parent) cs->classid = parent->classid; return 0; } static void cgrp_css_free(struct cgroup_subsys_state *css) { kfree(css_cls_state(css)); } static int update_classid_sock(const void *v, struct file *file, unsigned n) { int err; struct socket *sock = sock_from_file(file, &err); if (sock) { spin_lock(&cgroup_sk_update_lock); sock_cgroup_set_classid(&sock->sk->sk_cgrp_data, (unsigned long)v); spin_unlock(&cgroup_sk_update_lock); } return 0; } static void update_classid(struct cgroup_subsys_state *css, void *v) { struct css_task_iter it; struct task_struct *p; css_task_iter_start(css, &it); while ((p = css_task_iter_next(&it))) { task_lock(p); iterate_fd(p->files, 0, update_classid_sock, v); task_unlock(p); } css_task_iter_end(&it); } static void cgrp_attach(struct cgroup_taskset *tset) { struct cgroup_subsys_state *css; cgroup_taskset_first(tset, &css); update_classid(css, (void *)(unsigned long)css_cls_state(css)->classid); } static u64 read_classid(struct cgroup_subsys_state *css, struct cftype *cft) { return css_cls_state(css)->classid; } static int write_classid(struct cgroup_subsys_state *css, struct cftype *cft, u64 value) { struct cgroup_cls_state *cs = css_cls_state(css); cgroup_sk_alloc_disable(); cs->classid = (u32)value; update_classid(css, (void *)(unsigned long)cs->classid); return 0; } static struct cftype ss_files[] = { { .name = "classid", .read_u64 = read_classid, .write_u64 = write_classid, }, { } /* terminate */ }; struct cgroup_subsys net_cls_cgrp_subsys = { .css_alloc = cgrp_css_alloc, .css_online = cgrp_css_online, .css_free = cgrp_css_free, .attach = cgrp_attach, .legacy_cftypes = ss_files, }; 9454f79ebfc71e45fe246948ce4997'>root/include/trace/events/filelock.h

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