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0a268dbd TH |
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 | ||
9 | /* | |
10 | * A cgroup can be associated with multiple css_sets as different tasks may | |
11 | * belong to different cgroups on different hierarchies. In the other | |
12 | * direction, a css_set is naturally associated with multiple cgroups. | |
13 | * This M:N relationship is represented by the following link structure | |
14 | * which exists for each association and allows traversing the associations | |
15 | * from both sides. | |
16 | */ | |
17 | struct cgrp_cset_link { | |
18 | /* the cgroup and css_set this link associates */ | |
19 | struct cgroup *cgrp; | |
20 | struct css_set *cset; | |
21 | ||
22 | /* list of cgrp_cset_links anchored at cgrp->cset_links */ | |
23 | struct list_head cset_link; | |
24 | ||
25 | /* list of cgrp_cset_links anchored at css_set->cgrp_links */ | |
26 | struct list_head cgrp_link; | |
27 | }; | |
28 | ||
e595cd70 TH |
29 | /* used to track tasks and csets during migration */ |
30 | struct cgroup_taskset { | |
31 | /* the src and dst cset list running through cset->mg_node */ | |
32 | struct list_head src_csets; | |
33 | struct list_head dst_csets; | |
34 | ||
35 | /* the subsys currently being processed */ | |
36 | int ssid; | |
37 | ||
38 | /* | |
39 | * Fields for cgroup_taskset_*() iteration. | |
40 | * | |
41 | * Before migration is committed, the target migration tasks are on | |
42 | * ->mg_tasks of the csets on ->src_csets. After, on ->mg_tasks of | |
43 | * the csets on ->dst_csets. ->csets point to either ->src_csets | |
44 | * or ->dst_csets depending on whether migration is committed. | |
45 | * | |
46 | * ->cur_csets and ->cur_task point to the current task position | |
47 | * during iteration. | |
48 | */ | |
49 | struct list_head *csets; | |
50 | struct css_set *cur_cset; | |
51 | struct task_struct *cur_task; | |
52 | }; | |
53 | ||
54 | /* migration context also tracks preloading */ | |
55 | struct cgroup_mgctx { | |
56 | /* | |
57 | * Preloaded source and destination csets. Used to guarantee | |
58 | * atomic success or failure on actual migration. | |
59 | */ | |
60 | struct list_head preloaded_src_csets; | |
61 | struct list_head preloaded_dst_csets; | |
62 | ||
63 | /* tasks and csets to migrate */ | |
64 | struct cgroup_taskset tset; | |
bfc2cf6f TH |
65 | |
66 | /* subsystems affected by migration */ | |
67 | u16 ss_mask; | |
e595cd70 TH |
68 | }; |
69 | ||
70 | #define CGROUP_TASKSET_INIT(tset) \ | |
71 | { \ | |
72 | .src_csets = LIST_HEAD_INIT(tset.src_csets), \ | |
73 | .dst_csets = LIST_HEAD_INIT(tset.dst_csets), \ | |
74 | .csets = &tset.src_csets, \ | |
75 | } | |
76 | ||
77 | #define CGROUP_MGCTX_INIT(name) \ | |
78 | { \ | |
79 | LIST_HEAD_INIT(name.preloaded_src_csets), \ | |
80 | LIST_HEAD_INIT(name.preloaded_dst_csets), \ | |
81 | CGROUP_TASKSET_INIT(name.tset), \ | |
82 | } | |
83 | ||
84 | #define DEFINE_CGROUP_MGCTX(name) \ | |
85 | struct cgroup_mgctx name = CGROUP_MGCTX_INIT(name) | |
86 | ||
1592c9b2 TH |
87 | struct cgroup_sb_opts { |
88 | u16 subsys_mask; | |
89 | unsigned int flags; | |
90 | char *release_agent; | |
91 | bool cpuset_clone_children; | |
92 | char *name; | |
93 | /* User explicitly requested empty subsystem */ | |
94 | bool none; | |
95 | }; | |
96 | ||
0a268dbd TH |
97 | extern struct mutex cgroup_mutex; |
98 | extern spinlock_t css_set_lock; | |
99 | extern struct cgroup_subsys *cgroup_subsys[]; | |
100 | extern struct list_head cgroup_roots; | |
101 | extern struct file_system_type cgroup_fs_type; | |
102 | ||
103 | /* iterate across the hierarchies */ | |
104 | #define for_each_root(root) \ | |
105 | list_for_each_entry((root), &cgroup_roots, root_list) | |
106 | ||
107 | /** | |
108 | * for_each_subsys - iterate all enabled cgroup subsystems | |
109 | * @ss: the iteration cursor | |
110 | * @ssid: the index of @ss, CGROUP_SUBSYS_COUNT after reaching the end | |
111 | */ | |
112 | #define for_each_subsys(ss, ssid) \ | |
113 | for ((ssid) = 0; (ssid) < CGROUP_SUBSYS_COUNT && \ | |
114 | (((ss) = cgroup_subsys[ssid]) || true); (ssid)++) | |
115 | ||
116 | static inline bool cgroup_is_dead(const struct cgroup *cgrp) | |
117 | { | |
118 | return !(cgrp->self.flags & CSS_ONLINE); | |
119 | } | |
120 | ||
121 | static inline bool notify_on_release(const struct cgroup *cgrp) | |
122 | { | |
123 | return test_bit(CGRP_NOTIFY_ON_RELEASE, &cgrp->flags); | |
124 | } | |
125 | ||
dcfe149b TH |
126 | void put_css_set_locked(struct css_set *cset); |
127 | ||
128 | static inline void put_css_set(struct css_set *cset) | |
129 | { | |
130 | unsigned long flags; | |
131 | ||
132 | /* | |
133 | * Ensure that the refcount doesn't hit zero while any readers | |
134 | * can see it. Similar to atomic_dec_and_lock(), but for an | |
135 | * rwlock | |
136 | */ | |
137 | if (atomic_add_unless(&cset->refcount, -1, 1)) | |
138 | return; | |
139 | ||
140 | spin_lock_irqsave(&css_set_lock, flags); | |
141 | put_css_set_locked(cset); | |
142 | spin_unlock_irqrestore(&css_set_lock, flags); | |
143 | } | |
144 | ||
145 | /* | |
146 | * refcounted get/put for css_set objects | |
147 | */ | |
148 | static inline void get_css_set(struct css_set *cset) | |
149 | { | |
150 | atomic_inc(&cset->refcount); | |
151 | } | |
152 | ||
0a268dbd TH |
153 | bool cgroup_ssid_enabled(int ssid); |
154 | bool cgroup_on_dfl(const struct cgroup *cgrp); | |
155 | ||
156 | struct cgroup_root *cgroup_root_from_kf(struct kernfs_root *kf_root); | |
157 | struct cgroup *task_cgroup_from_root(struct task_struct *task, | |
158 | struct cgroup_root *root); | |
159 | struct cgroup *cgroup_kn_lock_live(struct kernfs_node *kn, bool drain_offline); | |
160 | void cgroup_kn_unlock(struct kernfs_node *kn); | |
161 | int cgroup_path_ns_locked(struct cgroup *cgrp, char *buf, size_t buflen, | |
162 | struct cgroup_namespace *ns); | |
163 | ||
1592c9b2 TH |
164 | void cgroup_free_root(struct cgroup_root *root); |
165 | void init_cgroup_root(struct cgroup_root *root, struct cgroup_sb_opts *opts); | |
166 | int cgroup_setup_root(struct cgroup_root *root, u16 ss_mask); | |
0a268dbd | 167 | int rebind_subsystems(struct cgroup_root *dst_root, u16 ss_mask); |
1592c9b2 TH |
168 | struct dentry *cgroup_do_mount(struct file_system_type *fs_type, int flags, |
169 | struct cgroup_root *root, unsigned long magic, | |
170 | struct cgroup_namespace *ns); | |
0a268dbd TH |
171 | |
172 | bool cgroup_may_migrate_to(struct cgroup *dst_cgrp); | |
e595cd70 TH |
173 | void cgroup_migrate_finish(struct cgroup_mgctx *mgctx); |
174 | void cgroup_migrate_add_src(struct css_set *src_cset, struct cgroup *dst_cgrp, | |
175 | struct cgroup_mgctx *mgctx); | |
176 | int cgroup_migrate_prepare_dst(struct cgroup_mgctx *mgctx); | |
0a268dbd | 177 | int cgroup_migrate(struct task_struct *leader, bool threadgroup, |
bfc2cf6f | 178 | struct cgroup_mgctx *mgctx); |
0a268dbd TH |
179 | |
180 | int cgroup_attach_task(struct cgroup *dst_cgrp, struct task_struct *leader, | |
181 | bool threadgroup); | |
182 | ssize_t __cgroup_procs_write(struct kernfs_open_file *of, char *buf, | |
183 | size_t nbytes, loff_t off, bool threadgroup); | |
184 | ssize_t cgroup_procs_write(struct kernfs_open_file *of, char *buf, size_t nbytes, | |
185 | loff_t off); | |
186 | ||
187 | void cgroup_lock_and_drain_offline(struct cgroup *cgrp); | |
188 | ||
1592c9b2 TH |
189 | int cgroup_mkdir(struct kernfs_node *parent_kn, const char *name, umode_t mode); |
190 | int cgroup_rmdir(struct kernfs_node *kn); | |
191 | int cgroup_show_path(struct seq_file *sf, struct kernfs_node *kf_node, | |
192 | struct kernfs_root *kf_root); | |
193 | ||
dcfe149b TH |
194 | /* |
195 | * namespace.c | |
196 | */ | |
197 | extern const struct proc_ns_operations cgroupns_operations; | |
198 | ||
0a268dbd TH |
199 | /* |
200 | * cgroup-v1.c | |
201 | */ | |
d62beb7f | 202 | extern struct cftype cgroup1_base_files[]; |
0a268dbd | 203 | extern const struct file_operations proc_cgroupstats_operations; |
1592c9b2 | 204 | extern struct kernfs_syscall_ops cgroup1_kf_syscall_ops; |
0a268dbd | 205 | |
d62beb7f TH |
206 | bool cgroup1_ssid_disabled(int ssid); |
207 | void cgroup1_pidlist_destroy_all(struct cgroup *cgrp); | |
208 | void cgroup1_release_agent(struct work_struct *work); | |
209 | void cgroup1_check_for_release(struct cgroup *cgrp); | |
1592c9b2 TH |
210 | struct dentry *cgroup1_mount(struct file_system_type *fs_type, int flags, |
211 | void *data, unsigned long magic, | |
212 | struct cgroup_namespace *ns); | |
0a268dbd TH |
213 | |
214 | #endif /* __CGROUP_INTERNAL_H */ |