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-rw-r--r--include/linux/cgroup-defs.h26
-rw-r--r--include/linux/cgroup.h66
-rw-r--r--include/linux/cgroup_subsys.h18
-rw-r--r--include/uapi/linux/magic.h1
4 files changed, 36 insertions, 75 deletions
diff --git a/include/linux/cgroup-defs.h b/include/linux/cgroup-defs.h
index 504d8591b6d3..7f334c2cbca9 100644
--- a/include/linux/cgroup-defs.h
+++ b/include/linux/cgroup-defs.h
@@ -34,17 +34,12 @@ struct seq_file;
/* define the enumeration of all cgroup subsystems */
#define SUBSYS(_x) _x ## _cgrp_id,
-#define SUBSYS_TAG(_t) CGROUP_ ## _t, \
- __unused_tag_ ## _t = CGROUP_ ## _t - 1,
enum cgroup_subsys_id {
#include <linux/cgroup_subsys.h>
CGROUP_SUBSYS_COUNT,
};
-#undef SUBSYS_TAG
#undef SUBSYS
-#define CGROUP_CANFORK_COUNT (CGROUP_CANFORK_END - CGROUP_CANFORK_START)
-
/* bits in struct cgroup_subsys_state flags field */
enum {
CSS_NO_REF = (1 << 0), /* no reference counting for this css */
@@ -66,7 +61,6 @@ enum {
/* cgroup_root->flags */
enum {
- CGRP_ROOT_SANE_BEHAVIOR = (1 << 0), /* __DEVEL__sane_behavior specified */
CGRP_ROOT_NOPREFIX = (1 << 1), /* mounted subsystems have no named prefix */
CGRP_ROOT_XATTR = (1 << 2), /* supports extended attributes */
};
@@ -90,7 +84,6 @@ enum {
*/
struct cgroup_file {
/* do not access any fields from outside cgroup core */
- struct list_head node; /* anchored at css->files */
struct kernfs_node *kn;
};
@@ -134,9 +127,6 @@ struct cgroup_subsys_state {
*/
u64 serial_nr;
- /* all cgroup_files associated with this css */
- struct list_head files;
-
/* percpu_ref killing and RCU release */
struct rcu_head rcu_head;
struct work_struct destroy_work;
@@ -440,15 +430,12 @@ struct cgroup_subsys {
void (*css_reset)(struct cgroup_subsys_state *css);
void (*css_e_css_changed)(struct cgroup_subsys_state *css);
- int (*can_attach)(struct cgroup_subsys_state *css,
- struct cgroup_taskset *tset);
- void (*cancel_attach)(struct cgroup_subsys_state *css,
- struct cgroup_taskset *tset);
- void (*attach)(struct cgroup_subsys_state *css,
- struct cgroup_taskset *tset);
- int (*can_fork)(struct task_struct *task, void **priv_p);
- void (*cancel_fork)(struct task_struct *task, void *priv);
- void (*fork)(struct task_struct *task, void *priv);
+ int (*can_attach)(struct cgroup_taskset *tset);
+ void (*cancel_attach)(struct cgroup_taskset *tset);
+ void (*attach)(struct cgroup_taskset *tset);
+ int (*can_fork)(struct task_struct *task);
+ void (*cancel_fork)(struct task_struct *task);
+ void (*fork)(struct task_struct *task);
void (*exit)(struct task_struct *task);
void (*free)(struct task_struct *task);
void (*bind)(struct cgroup_subsys_state *root_css);
@@ -534,7 +521,6 @@ static inline void cgroup_threadgroup_change_end(struct task_struct *tsk)
#else /* CONFIG_CGROUPS */
-#define CGROUP_CANFORK_COUNT 0
#define CGROUP_SUBSYS_COUNT 0
static inline void cgroup_threadgroup_change_begin(struct task_struct *tsk) {}
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 4c3ffab81ba7..9d70b4848260 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -89,6 +89,7 @@ int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from);
int cgroup_add_dfl_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);
int cgroup_add_legacy_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);
int cgroup_rm_cftypes(struct cftype *cfts);
+void cgroup_file_notify(struct cgroup_file *cfile);
char *task_cgroup_path(struct task_struct *task, char *buf, size_t buflen);
int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry);
@@ -96,12 +97,9 @@ int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns,
struct pid *pid, struct task_struct *tsk);
void cgroup_fork(struct task_struct *p);
-extern int cgroup_can_fork(struct task_struct *p,
- void *ss_priv[CGROUP_CANFORK_COUNT]);
-extern void cgroup_cancel_fork(struct task_struct *p,
- void *ss_priv[CGROUP_CANFORK_COUNT]);
-extern void cgroup_post_fork(struct task_struct *p,
- void *old_ss_priv[CGROUP_CANFORK_COUNT]);
+extern int cgroup_can_fork(struct task_struct *p);
+extern void cgroup_cancel_fork(struct task_struct *p);
+extern void cgroup_post_fork(struct task_struct *p);
void cgroup_exit(struct task_struct *p);
void cgroup_free(struct task_struct *p);
@@ -120,8 +118,10 @@ struct cgroup_subsys_state *css_rightmost_descendant(struct cgroup_subsys_state
struct cgroup_subsys_state *css_next_descendant_post(struct cgroup_subsys_state *pos,
struct cgroup_subsys_state *css);
-struct task_struct *cgroup_taskset_first(struct cgroup_taskset *tset);
-struct task_struct *cgroup_taskset_next(struct cgroup_taskset *tset);
+struct task_struct *cgroup_taskset_first(struct cgroup_taskset *tset,
+ struct cgroup_subsys_state **dst_cssp);
+struct task_struct *cgroup_taskset_next(struct cgroup_taskset *tset,
+ struct cgroup_subsys_state **dst_cssp);
void css_task_iter_start(struct cgroup_subsys_state *css,
struct css_task_iter *it);
@@ -236,30 +236,39 @@ void css_task_iter_end(struct css_task_iter *it);
/**
* cgroup_taskset_for_each - iterate cgroup_taskset
* @task: the loop cursor
+ * @dst_css: the destination css
* @tset: taskset to iterate
*
* @tset may contain multiple tasks and they may belong to multiple
- * processes. When there are multiple tasks in @tset, if a task of a
- * process is in @tset, all tasks of the process are in @tset. Also, all
- * are guaranteed to share the same source and destination csses.
+ * processes.
+ *
+ * On the v2 hierarchy, there may be tasks from multiple processes and they
+ * may not share the source or destination csses.
+ *
+ * On traditional hierarchies, when there are multiple tasks in @tset, if a
+ * task of a process is in @tset, all tasks of the process are in @tset.
+ * Also, all are guaranteed to share the same source and destination csses.
*
* Iteration is not in any specific order.
*/
-#define cgroup_taskset_for_each(task, tset) \
- for ((task) = cgroup_taskset_first((tset)); (task); \
- (task) = cgroup_taskset_next((tset)))
+#define cgroup_taskset_for_each(task, dst_css, tset) \
+ for ((task) = cgroup_taskset_first((tset), &(dst_css)); \
+ (task); \
+ (task) = cgroup_taskset_next((tset), &(dst_css)))
/**
* cgroup_taskset_for_each_leader - iterate group leaders in a cgroup_taskset
* @leader: the loop cursor
+ * @dst_css: the destination css
* @tset: takset to iterate
*
* Iterate threadgroup leaders of @tset. For single-task migrations, @tset
* may not contain any.
*/
-#define cgroup_taskset_for_each_leader(leader, tset) \
- for ((leader) = cgroup_taskset_first((tset)); (leader); \
- (leader) = cgroup_taskset_next((tset))) \
+#define cgroup_taskset_for_each_leader(leader, dst_css, tset) \
+ for ((leader) = cgroup_taskset_first((tset), &(dst_css)); \
+ (leader); \
+ (leader) = cgroup_taskset_next((tset), &(dst_css))) \
if ((leader) != (leader)->group_leader) \
; \
else
@@ -539,19 +548,6 @@ static inline void pr_cont_cgroup_path(struct cgroup *cgrp)
pr_cont_kernfs_path(cgrp->kn);
}
-/**
- * cgroup_file_notify - generate a file modified event for a cgroup_file
- * @cfile: target cgroup_file
- *
- * @cfile must have been obtained by setting cftype->file_offset.
- */
-static inline void cgroup_file_notify(struct cgroup_file *cfile)
-{
- /* might not have been created due to one of the CFTYPE selector flags */
- if (cfile->kn)
- kernfs_notify(cfile->kn);
-}
-
#else /* !CONFIG_CGROUPS */
struct cgroup_subsys_state;
@@ -563,13 +559,9 @@ static inline int cgroupstats_build(struct cgroupstats *stats,
struct dentry *dentry) { return -EINVAL; }
static inline void cgroup_fork(struct task_struct *p) {}
-static inline int cgroup_can_fork(struct task_struct *p,
- void *ss_priv[CGROUP_CANFORK_COUNT])
-{ return 0; }
-static inline void cgroup_cancel_fork(struct task_struct *p,
- void *ss_priv[CGROUP_CANFORK_COUNT]) {}
-static inline void cgroup_post_fork(struct task_struct *p,
- void *ss_priv[CGROUP_CANFORK_COUNT]) {}
+static inline int cgroup_can_fork(struct task_struct *p) { return 0; }
+static inline void cgroup_cancel_fork(struct task_struct *p) {}
+static inline void cgroup_post_fork(struct task_struct *p) {}
static inline void cgroup_exit(struct task_struct *p) {}
static inline void cgroup_free(struct task_struct *p) {}
diff --git a/include/linux/cgroup_subsys.h b/include/linux/cgroup_subsys.h
index 1a96fdaa33d5..0df0336acee9 100644
--- a/include/linux/cgroup_subsys.h
+++ b/include/linux/cgroup_subsys.h
@@ -6,14 +6,8 @@
/*
* This file *must* be included with SUBSYS() defined.
- * SUBSYS_TAG() is a noop if undefined.
*/
-#ifndef SUBSYS_TAG
-#define __TMP_SUBSYS_TAG
-#define SUBSYS_TAG(_x)
-#endif
-
#if IS_ENABLED(CONFIG_CPUSETS)
SUBSYS(cpuset)
#endif
@@ -58,17 +52,10 @@ SUBSYS(net_prio)
SUBSYS(hugetlb)
#endif
-/*
- * Subsystems that implement the can_fork() family of callbacks.
- */
-SUBSYS_TAG(CANFORK_START)
-
#if IS_ENABLED(CONFIG_CGROUP_PIDS)
SUBSYS(pids)
#endif
-SUBSYS_TAG(CANFORK_END)
-
/*
* The following subsystems are not supported on the default hierarchy.
*/
@@ -76,11 +63,6 @@ SUBSYS_TAG(CANFORK_END)
SUBSYS(debug)
#endif
-#ifdef __TMP_SUBSYS_TAG
-#undef __TMP_SUBSYS_TAG
-#undef SUBSYS_TAG
-#endif
-
/*
* DO NOT ADD ANY SUBSYSTEM WITHOUT EXPLICIT ACKS FROM CGROUP MAINTAINERS.
*/
diff --git a/include/uapi/linux/magic.h b/include/uapi/linux/magic.h
index accb036bbc9c..b283d56c1db9 100644
--- a/include/uapi/linux/magic.h
+++ b/include/uapi/linux/magic.h
@@ -54,6 +54,7 @@
#define SMB_SUPER_MAGIC 0x517B
#define CGROUP_SUPER_MAGIC 0x27e0eb
+#define CGROUP2_SUPER_MAGIC 0x63677270
#define STACK_END_MAGIC 0x57AC6E9D
generated by cgit v1.2.3 (git 2.39.0) at 2025-01-07 20:39:15 +0300