cgroup.c (e4f8d81c738db6d3ffdabfb8329aa2feaa310699) cgroup.c (488dee96bb62f0b3d9e678cf42574034d5b033a5)
1/*
2 * Generic process-grouping system.
3 *
4 * Based originally on the cpuset system, extracted by Paul Menage
5 * Copyright (C) 2006 Google, Inc
6 *
7 * Notifications support
8 * Copyright (C) 2009 Nokia Corporation

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78DEFINE_MUTEX(cgroup_mutex);
79DEFINE_SPINLOCK(css_set_lock);
80
81#ifdef CONFIG_PROVE_RCU
82EXPORT_SYMBOL_GPL(cgroup_mutex);
83EXPORT_SYMBOL_GPL(css_set_lock);
84#endif
85
1/*
2 * Generic process-grouping system.
3 *
4 * Based originally on the cpuset system, extracted by Paul Menage
5 * Copyright (C) 2006 Google, Inc
6 *
7 * Notifications support
8 * Copyright (C) 2009 Nokia Corporation

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78DEFINE_MUTEX(cgroup_mutex);
79DEFINE_SPINLOCK(css_set_lock);
80
81#ifdef CONFIG_PROVE_RCU
82EXPORT_SYMBOL_GPL(cgroup_mutex);
83EXPORT_SYMBOL_GPL(css_set_lock);
84#endif
85
86DEFINE_SPINLOCK(trace_cgroup_path_lock);
87char trace_cgroup_path[TRACE_CGROUP_PATH_LEN];
88
89/*
90 * Protects cgroup_idr and css_idr so that IDs can be released without
91 * grabbing cgroup_mutex.
92 */
93static DEFINE_SPINLOCK(cgroup_idr_lock);
94
95/*
96 * Protects cgroup_file->kn for !self csses. It synchronizes notifications

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2636 /* prepare dst csets and commit */
2637 ret = cgroup_migrate_prepare_dst(&mgctx);
2638 if (!ret)
2639 ret = cgroup_migrate(leader, threadgroup, &mgctx);
2640
2641 cgroup_migrate_finish(&mgctx);
2642
2643 if (!ret)
86/*
87 * Protects cgroup_idr and css_idr so that IDs can be released without
88 * grabbing cgroup_mutex.
89 */
90static DEFINE_SPINLOCK(cgroup_idr_lock);
91
92/*
93 * Protects cgroup_file->kn for !self csses. It synchronizes notifications

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2633 /* prepare dst csets and commit */
2634 ret = cgroup_migrate_prepare_dst(&mgctx);
2635 if (!ret)
2636 ret = cgroup_migrate(leader, threadgroup, &mgctx);
2637
2638 cgroup_migrate_finish(&mgctx);
2639
2640 if (!ret)
2644 TRACE_CGROUP_PATH(attach_task, dst_cgrp, leader, threadgroup);
2641 trace_cgroup_attach_task(dst_cgrp, leader, threadgroup);
2645
2646 return ret;
2647}
2648
2649struct task_struct *cgroup_procs_write_start(char *buf, bool threadgroup)
2650 __acquires(&cgroup_threadgroup_rwsem)
2651{
2652 struct task_struct *tsk;

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3555 struct kernfs_node *kn;
3556 struct lock_class_key *key = NULL;
3557 int ret;
3558
3559#ifdef CONFIG_DEBUG_LOCK_ALLOC
3560 key = &cft->lockdep_key;
3561#endif
3562 kn = __kernfs_create_file(cgrp->kn, cgroup_file_name(cgrp, cft, name),
2642
2643 return ret;
2644}
2645
2646struct task_struct *cgroup_procs_write_start(char *buf, bool threadgroup)
2647 __acquires(&cgroup_threadgroup_rwsem)
2648{
2649 struct task_struct *tsk;

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3552 struct kernfs_node *kn;
3553 struct lock_class_key *key = NULL;
3554 int ret;
3555
3556#ifdef CONFIG_DEBUG_LOCK_ALLOC
3557 key = &cft->lockdep_key;
3558#endif
3559 kn = __kernfs_create_file(cgrp->kn, cgroup_file_name(cgrp, cft, name),
3563 cgroup_file_mode(cft), 0, cft->kf_ops, cft,
3560 cgroup_file_mode(cft),
3561 GLOBAL_ROOT_UID, GLOBAL_ROOT_GID,
3562 0, cft->kf_ops, cft,
3564 NULL, key);
3565 if (IS_ERR(kn))
3566 return PTR_ERR(kn);
3567
3568 ret = cgroup_kn_set_ugid(kn);
3569 if (ret) {
3570 kernfs_remove(kn);
3571 return ret;

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4632
4633 cgroup_idr_replace(&ss->css_idr, NULL, css->id);
4634 if (ss->css_released)
4635 ss->css_released(css);
4636 } else {
4637 struct cgroup *tcgrp;
4638
4639 /* cgroup release path */
3563 NULL, key);
3564 if (IS_ERR(kn))
3565 return PTR_ERR(kn);
3566
3567 ret = cgroup_kn_set_ugid(kn);
3568 if (ret) {
3569 kernfs_remove(kn);
3570 return ret;

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4631
4632 cgroup_idr_replace(&ss->css_idr, NULL, css->id);
4633 if (ss->css_released)
4634 ss->css_released(css);
4635 } else {
4636 struct cgroup *tcgrp;
4637
4638 /* cgroup release path */
4640 TRACE_CGROUP_PATH(release, cgrp);
4639 trace_cgroup_release(cgrp);
4641
4642 if (cgroup_on_dfl(cgrp))
4643 cgroup_rstat_flush(cgrp);
4644
4645 for (tcgrp = cgroup_parent(cgrp); tcgrp;
4646 tcgrp = cgroup_parent(tcgrp))
4647 tcgrp->nr_dying_descendants--;
4648

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4975 ret = css_populate_dir(&cgrp->self);
4976 if (ret)
4977 goto out_destroy;
4978
4979 ret = cgroup_apply_control_enable(cgrp);
4980 if (ret)
4981 goto out_destroy;
4982
4640
4641 if (cgroup_on_dfl(cgrp))
4642 cgroup_rstat_flush(cgrp);
4643
4644 for (tcgrp = cgroup_parent(cgrp); tcgrp;
4645 tcgrp = cgroup_parent(tcgrp))
4646 tcgrp->nr_dying_descendants--;
4647

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4974 ret = css_populate_dir(&cgrp->self);
4975 if (ret)
4976 goto out_destroy;
4977
4978 ret = cgroup_apply_control_enable(cgrp);
4979 if (ret)
4980 goto out_destroy;
4981
4983 TRACE_CGROUP_PATH(mkdir, cgrp);
4982 trace_cgroup_mkdir(cgrp);
4984
4985 /* let's create and online css's */
4986 kernfs_activate(kn);
4987
4988 ret = 0;
4989 goto out_unlock;
4990
4991out_destroy:

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5163 struct cgroup *cgrp;
5164 int ret = 0;
5165
5166 cgrp = cgroup_kn_lock_live(kn, false);
5167 if (!cgrp)
5168 return 0;
5169
5170 ret = cgroup_destroy_locked(cgrp);
4983
4984 /* let's create and online css's */
4985 kernfs_activate(kn);
4986
4987 ret = 0;
4988 goto out_unlock;
4989
4990out_destroy:

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5162 struct cgroup *cgrp;
5163 int ret = 0;
5164
5165 cgrp = cgroup_kn_lock_live(kn, false);
5166 if (!cgrp)
5167 return 0;
5168
5169 ret = cgroup_destroy_locked(cgrp);
5170
5171 if (!ret)
5171 if (!ret)
5172 TRACE_CGROUP_PATH(rmdir, cgrp);
5172 trace_cgroup_rmdir(cgrp);
5173
5174 cgroup_kn_unlock(kn);
5175 return ret;
5176}
5177
5178static struct kernfs_syscall_ops cgroup_kf_syscall_ops = {
5179 .show_options = cgroup_show_options,
5180 .remount_fs = cgroup_remount,

--- 802 unchanged lines hidden --- 		5173
5174 cgroup_kn_unlock(kn);
5175 return ret;
5176}
5177
5178static struct kernfs_syscall_ops cgroup_kf_syscall_ops = {
5179 .show_options = cgroup_show_options,
5180 .remount_fs = cgroup_remount,

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