#include <linux/xattr.h>
#include <linux/fs.h>
#include <linux/percpu-refcount.h>
+#include <linux/seq_file.h>
#ifdef CONFIG_CGROUPS
struct cgroup_subsys;
struct inode;
struct cgroup;
-struct css_id;
-struct eventfd_ctx;
extern int cgroup_init_early(void);
extern int cgroup_init(void);
struct cgroup_subsys_state *parent;
unsigned long flags;
- /* ID for this css, if possible */
- struct css_id __rcu *id;
/* percpu_ref killing and RCU release */
struct rcu_head rcu_head;
*
* The ID of the root cgroup is always 0, and a new cgroup
* will be assigned with a smallest available ID.
+ *
+ * Allocating/Removing ID must be protected by cgroup_mutex.
*/
int id;
struct rcu_head rcu_head;
struct work_struct destroy_work;
- /* List of events which userspace want to receive */
- struct list_head event_list;
- spinlock_t event_list_lock;
-
/* directory xattrs */
struct simple_xattrs xattrs;
};
* - "tasks" is removed. Everything should be at process
* granularity. Use "cgroup.procs" instead.
*
+ * - "cgroup.procs" is not sorted. pids will be unique unless they
+ * got recycled inbetween reads.
+ *
* - "release_agent" and "notify_on_release" are removed.
* Replacement notification mechanism will be implemented.
*
/* Unique id for this hierarchy. */
int hierarchy_id;
- /* A list running through the attached subsystems */
- struct list_head subsys_list;
-
/* The root cgroup for this hierarchy */
struct cgroup top_cgroup;
struct rcu_head rcu_head;
};
-/*
- * cgroup_map_cb is an abstract callback API for reporting map-valued
- * control files
- */
-
-struct cgroup_map_cb {
- int (*fill)(struct cgroup_map_cb *cb, const char *key, u64 value);
- void *state;
-};
-
/*
* struct cftype: handler definitions for cgroup control files
*
*/
struct cgroup_subsys *ss;
- int (*open)(struct inode *inode, struct file *file);
- ssize_t (*read)(struct cgroup_subsys_state *css, struct cftype *cft,
- struct file *file,
- char __user *buf, size_t nbytes, loff_t *ppos);
/*
* read_u64() is a shortcut for the common case of returning a
* single integer. Use it in place of read()
* read_s64() is a signed version of read_u64()
*/
s64 (*read_s64)(struct cgroup_subsys_state *css, struct cftype *cft);
- /*
- * read_map() is used for defining a map of key/value
- * pairs. It should call cb->fill(cb, key, value) for each
- * entry. The key/value pairs (and their ordering) should not
- * change between reboots.
- */
- int (*read_map)(struct cgroup_subsys_state *css, struct cftype *cft,
- struct cgroup_map_cb *cb);
- /*
- * read_seq_string() is used for outputting a simple sequence
- * using seqfile.
- */
- int (*read_seq_string)(struct cgroup_subsys_state *css,
- struct cftype *cft, struct seq_file *m);
- ssize_t (*write)(struct cgroup_subsys_state *css, struct cftype *cft,
- struct file *file,
- const char __user *buf, size_t nbytes, loff_t *ppos);
+ /* generic seq_file read interface */
+ int (*seq_show)(struct seq_file *sf, void *v);
+
+ /* optional ops, implement all or none */
+ void *(*seq_start)(struct seq_file *sf, loff_t *ppos);
+ void *(*seq_next)(struct seq_file *sf, void *v, loff_t *ppos);
+ void (*seq_stop)(struct seq_file *sf, void *v);
/*
* write_u64() is a shortcut for the common case of accepting
* kick type for multiplexing.
*/
int (*trigger)(struct cgroup_subsys_state *css, unsigned int event);
-
- int (*release)(struct inode *inode, struct file *file);
-
- /*
- * register_event() callback will be used to add new userspace
- * waiter for changes related to the cftype. Implement it if
- * you want to provide this functionality. Use eventfd_signal()
- * on eventfd to send notification to userspace.
- */
- int (*register_event)(struct cgroup_subsys_state *css,
- struct cftype *cft, struct eventfd_ctx *eventfd,
- const char *args);
- /*
- * unregister_event() callback will be called when userspace
- * closes the eventfd or on cgroup removing.
- * This callback must be implemented, if you want provide
- * notification functionality.
- */
- void (*unregister_event)(struct cgroup_subsys_state *css,
- struct cftype *cft,
- struct eventfd_ctx *eventfd);
};
/*
struct cftype *cfts;
};
+/*
+ * cgroupfs file entry, pointed to from leaf dentry->d_fsdata. Don't
+ * access directly.
+ */
+struct cfent {
+ struct list_head node;
+ struct dentry *dentry;
+ struct cftype *type;
+ struct cgroup_subsys_state *css;
+
+ /* file xattrs */
+ struct simple_xattrs xattrs;
+};
+
+/* seq_file->private points to the following, only ->priv is public */
+struct cgroup_open_file {
+ struct cfent *cfe;
+ void *priv;
+};
+
/*
* See the comment above CGRP_ROOT_SANE_BEHAVIOR for details. This
* function can be called as long as @cgrp is accessible.
return rcu_dereference(cgrp->name)->name;
}
+static inline struct cgroup_subsys_state *seq_css(struct seq_file *seq)
+{
+ struct cgroup_open_file *of = seq->private;
+ return of->cfe->css;
+}
+
+static inline struct cftype *seq_cft(struct seq_file *seq)
+{
+ struct cgroup_open_file *of = seq->private;
+ return of->cfe->type;
+}
+
int cgroup_add_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);
int cgroup_rm_cftypes(struct cftype *cfts);
#define MAX_CGROUP_TYPE_NAMELEN 32
const char *name;
- /*
- * Link to parent, and list entry in parent's children.
- * Protected by cgroup_lock()
- */
+ /* link to parent, protected by cgroup_lock() */
struct cgroupfs_root *root;
- struct list_head sibling;
/* list of cftype_sets */
struct list_head cftsets;
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