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1 | #ifndef __CGROUP_INTERNAL_H | |
2 | #define __CGROUP_INTERNAL_H | |
3 | ||
4 | #include <linux/cgroup.h> | |
5 | #include <linux/kernfs.h> | |
6 | #include <linux/workqueue.h> | |
7 | #include <linux/list.h> | |
8 | #include <linux/refcount.h> | |
9 | ||
10 | /* | |
11 | * A cgroup can be associated with multiple css_sets as different tasks may | |
12 | * belong to different cgroups on different hierarchies. In the other | |
13 | * direction, a css_set is naturally associated with multiple cgroups. | |
14 | * This M:N relationship is represented by the following link structure | |
15 | * which exists for each association and allows traversing the associations | |
16 | * from both sides. | |
17 | */ | |
18 | struct cgrp_cset_link { | |
19 | /* the cgroup and css_set this link associates */ | |
20 | struct cgroup *cgrp; | |
21 | struct css_set *cset; | |
22 | ||
23 | /* list of cgrp_cset_links anchored at cgrp->cset_links */ | |
24 | struct list_head cset_link; | |
25 | ||
26 | /* list of cgrp_cset_links anchored at css_set->cgrp_links */ | |
27 | struct list_head cgrp_link; | |
28 | }; | |
29 | ||
30 | /* used to track tasks and csets during migration */ | |
31 | struct cgroup_taskset { | |
32 | /* the src and dst cset list running through cset->mg_node */ | |
33 | struct list_head src_csets; | |
34 | struct list_head dst_csets; | |
35 | ||
36 | /* the number of tasks in the set */ | |
37 | int nr_tasks; | |
38 | ||
39 | /* the subsys currently being processed */ | |
40 | int ssid; | |
41 | ||
42 | /* | |
43 | * Fields for cgroup_taskset_*() iteration. | |
44 | * | |
45 | * Before migration is committed, the target migration tasks are on | |
46 | * ->mg_tasks of the csets on ->src_csets. After, on ->mg_tasks of | |
47 | * the csets on ->dst_csets. ->csets point to either ->src_csets | |
48 | * or ->dst_csets depending on whether migration is committed. | |
49 | * | |
50 | * ->cur_csets and ->cur_task point to the current task position | |
51 | * during iteration. | |
52 | */ | |
53 | struct list_head *csets; | |
54 | struct css_set *cur_cset; | |
55 | struct task_struct *cur_task; | |
56 | }; | |
57 | ||
58 | /* migration context also tracks preloading */ | |
59 | struct cgroup_mgctx { | |
60 | /* | |
61 | * Preloaded source and destination csets. Used to guarantee | |
62 | * atomic success or failure on actual migration. | |
63 | */ | |
64 | struct list_head preloaded_src_csets; | |
65 | struct list_head preloaded_dst_csets; | |
66 | ||
67 | /* tasks and csets to migrate */ | |
68 | struct cgroup_taskset tset; | |
69 | ||
70 | /* subsystems affected by migration */ | |
71 | u16 ss_mask; | |
72 | }; | |
73 | ||
74 | #define CGROUP_TASKSET_INIT(tset) \ | |
75 | { \ | |
76 | .src_csets = LIST_HEAD_INIT(tset.src_csets), \ | |
77 | .dst_csets = LIST_HEAD_INIT(tset.dst_csets), \ | |
78 | .csets = &tset.src_csets, \ | |
79 | } | |
80 | ||
81 | #define CGROUP_MGCTX_INIT(name) \ | |
82 | { \ | |
83 | LIST_HEAD_INIT(name.preloaded_src_csets), \ | |
84 | LIST_HEAD_INIT(name.preloaded_dst_csets), \ | |
85 | CGROUP_TASKSET_INIT(name.tset), \ | |
86 | } | |
87 | ||
88 | #define DEFINE_CGROUP_MGCTX(name) \ | |
89 | struct cgroup_mgctx name = CGROUP_MGCTX_INIT(name) | |
90 | ||
91 | struct cgroup_sb_opts { | |
92 | u16 subsys_mask; | |
93 | unsigned int flags; | |
94 | char *release_agent; | |
95 | bool cpuset_clone_children; | |
96 | char *name; | |
97 | /* User explicitly requested empty subsystem */ | |
98 | bool none; | |
99 | }; | |
100 | ||
101 | extern struct mutex cgroup_mutex; | |
102 | extern spinlock_t css_set_lock; | |
103 | extern struct cgroup_subsys *cgroup_subsys[]; | |
104 | extern struct list_head cgroup_roots; | |
105 | extern struct file_system_type cgroup_fs_type; | |
106 | ||
107 | /* iterate across the hierarchies */ | |
108 | #define for_each_root(root) \ | |
109 | list_for_each_entry((root), &cgroup_roots, root_list) | |
110 | ||
111 | /** | |
112 | * for_each_subsys - iterate all enabled cgroup subsystems | |
113 | * @ss: the iteration cursor | |
114 | * @ssid: the index of @ss, CGROUP_SUBSYS_COUNT after reaching the end | |
115 | */ | |
116 | #define for_each_subsys(ss, ssid) \ | |
117 | for ((ssid) = 0; (ssid) < CGROUP_SUBSYS_COUNT && \ | |
118 | (((ss) = cgroup_subsys[ssid]) || true); (ssid)++) | |
119 | ||
120 | static inline bool cgroup_is_dead(const struct cgroup *cgrp) | |
121 | { | |
122 | return !(cgrp->self.flags & CSS_ONLINE); | |
123 | } | |
124 | ||
125 | static inline bool notify_on_release(const struct cgroup *cgrp) | |
126 | { | |
127 | return test_bit(CGRP_NOTIFY_ON_RELEASE, &cgrp->flags); | |
128 | } | |
129 | ||
130 | void put_css_set_locked(struct css_set *cset); | |
131 | ||
132 | static inline void put_css_set(struct css_set *cset) | |
133 | { | |
134 | unsigned long flags; | |
135 | ||
136 | /* | |
137 | * Ensure that the refcount doesn't hit zero while any readers | |
138 | * can see it. Similar to atomic_dec_and_lock(), but for an | |
139 | * rwlock | |
140 | */ | |
141 | if (refcount_dec_not_one(&cset->refcount)) | |
142 | return; | |
143 | ||
144 | spin_lock_irqsave(&css_set_lock, flags); | |
145 | put_css_set_locked(cset); | |
146 | spin_unlock_irqrestore(&css_set_lock, flags); | |
147 | } | |
148 | ||
149 | /* | |
150 | * refcounted get/put for css_set objects | |
151 | */ | |
152 | static inline void get_css_set(struct css_set *cset) | |
153 | { | |
154 | refcount_inc(&cset->refcount); | |
155 | } | |
156 | ||
157 | bool cgroup_ssid_enabled(int ssid); | |
158 | bool cgroup_on_dfl(const struct cgroup *cgrp); | |
159 | ||
160 | struct cgroup_root *cgroup_root_from_kf(struct kernfs_root *kf_root); | |
161 | struct cgroup *task_cgroup_from_root(struct task_struct *task, | |
162 | struct cgroup_root *root); | |
163 | struct cgroup *cgroup_kn_lock_live(struct kernfs_node *kn, bool drain_offline); | |
164 | void cgroup_kn_unlock(struct kernfs_node *kn); | |
165 | int cgroup_path_ns_locked(struct cgroup *cgrp, char *buf, size_t buflen, | |
166 | struct cgroup_namespace *ns); | |
167 | ||
168 | void cgroup_free_root(struct cgroup_root *root); | |
169 | void init_cgroup_root(struct cgroup_root *root, struct cgroup_sb_opts *opts); | |
170 | int cgroup_setup_root(struct cgroup_root *root, u16 ss_mask, int ref_flags); | |
171 | int rebind_subsystems(struct cgroup_root *dst_root, u16 ss_mask); | |
172 | struct dentry *cgroup_do_mount(struct file_system_type *fs_type, int flags, | |
173 | struct cgroup_root *root, unsigned long magic, | |
174 | struct cgroup_namespace *ns); | |
175 | ||
176 | bool cgroup_may_migrate_to(struct cgroup *dst_cgrp); | |
177 | void cgroup_migrate_finish(struct cgroup_mgctx *mgctx); | |
178 | void cgroup_migrate_add_src(struct css_set *src_cset, struct cgroup *dst_cgrp, | |
179 | struct cgroup_mgctx *mgctx); | |
180 | int cgroup_migrate_prepare_dst(struct cgroup_mgctx *mgctx); | |
181 | int cgroup_migrate(struct task_struct *leader, bool threadgroup, | |
182 | struct cgroup_mgctx *mgctx); | |
183 | ||
184 | int cgroup_attach_task(struct cgroup *dst_cgrp, struct task_struct *leader, | |
185 | bool threadgroup); | |
186 | ssize_t __cgroup_procs_write(struct kernfs_open_file *of, char *buf, | |
187 | size_t nbytes, loff_t off, bool threadgroup); | |
188 | ssize_t cgroup_procs_write(struct kernfs_open_file *of, char *buf, size_t nbytes, | |
189 | loff_t off); | |
190 | ||
191 | void cgroup_lock_and_drain_offline(struct cgroup *cgrp); | |
192 | ||
193 | int cgroup_mkdir(struct kernfs_node *parent_kn, const char *name, umode_t mode); | |
194 | int cgroup_rmdir(struct kernfs_node *kn); | |
195 | int cgroup_show_path(struct seq_file *sf, struct kernfs_node *kf_node, | |
196 | struct kernfs_root *kf_root); | |
197 | ||
198 | int cgroup_task_count(const struct cgroup *cgrp); | |
199 | ||
200 | /* | |
201 | * namespace.c | |
202 | */ | |
203 | extern const struct proc_ns_operations cgroupns_operations; | |
204 | ||
205 | /* | |
206 | * cgroup-v1.c | |
207 | */ | |
208 | extern struct cftype cgroup1_base_files[]; | |
209 | extern const struct file_operations proc_cgroupstats_operations; | |
210 | extern struct kernfs_syscall_ops cgroup1_kf_syscall_ops; | |
211 | ||
212 | bool cgroup1_ssid_disabled(int ssid); | |
213 | void cgroup1_pidlist_destroy_all(struct cgroup *cgrp); | |
214 | void cgroup1_release_agent(struct work_struct *work); | |
215 | void cgroup1_check_for_release(struct cgroup *cgrp); | |
216 | struct dentry *cgroup1_mount(struct file_system_type *fs_type, int flags, | |
217 | void *data, unsigned long magic, | |
218 | struct cgroup_namespace *ns); | |
219 | ||
220 | #endif /* __CGROUP_INTERNAL_H */ |