1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _TRACEFS_INTERNAL_H
 3#define _TRACEFS_INTERNAL_H
 4
 5enum {
 6	TRACEFS_EVENT_INODE		= BIT(1),
 7	TRACEFS_GID_PERM_SET		= BIT(2),
 8	TRACEFS_UID_PERM_SET		= BIT(3),
 9	TRACEFS_INSTANCE_INODE		= BIT(4),
 
10};
11
12struct tracefs_inode {
13	struct inode            vfs_inode;
14	/* The below gets initialized with memset_after(ti, 0, vfs_inode) */
15	struct list_head	list;
16	unsigned long           flags;
17	void                    *private;
18};
19
20/*
21 * struct eventfs_attr - cache the mode and ownership of a eventfs entry
22 * @mode:	saved mode plus flags of what is saved
23 * @uid:	saved uid if changed
24 * @gid:	saved gid if changed
25 */
26struct eventfs_attr {
27	int				mode;
28	kuid_t				uid;
29	kgid_t				gid;
30};
31
32/*
33 * struct eventfs_inode - hold the properties of the eventfs directories.
34 * @list:	link list into the parent directory
35 * @rcu:	Union with @list for freeing
36 * @children:	link list into the child eventfs_inode
37 * @entries:	the array of entries representing the files in the directory
38 * @name:	the name of the directory to create
 
39 * @entry_attrs: Saved mode and ownership of the @d_children
40 * @data:	The private data to pass to the callbacks
41 * @attr:	Saved mode and ownership of eventfs_inode itself
42 * @is_freed:	Flag set if the eventfs is on its way to be freed
43 *                Note if is_freed is set, then dentry is corrupted.
44 * @is_events:	Flag set for only the top level "events" directory
45 * @nr_entries: The number of items in @entries
46 * @ino:	The saved inode number
47 */
48struct eventfs_inode {
49	union {
50		struct list_head	list;
51		struct rcu_head		rcu;
52	};
53	struct list_head		children;
54	const struct eventfs_entry	*entries;
55	const char			*name;
 
56	struct eventfs_attr		*entry_attrs;
57	void				*data;
58	struct eventfs_attr		attr;
59	struct kref			kref;
60	unsigned int			is_freed:1;
61	unsigned int			is_events:1;
62	unsigned int			nr_entries:30;
63	unsigned int			ino;
64};
65
66static inline struct tracefs_inode *get_tracefs(const struct inode *inode)
67{
68	return container_of(inode, struct tracefs_inode, vfs_inode);
69}
70
71struct dentry *tracefs_start_creating(const char *name, struct dentry *parent);
72struct dentry *tracefs_end_creating(struct dentry *dentry);
73struct dentry *tracefs_failed_creating(struct dentry *dentry);
74struct inode *tracefs_get_inode(struct super_block *sb);
75
76void eventfs_remount(struct tracefs_inode *ti, bool update_uid, bool update_gid);
77void eventfs_d_release(struct dentry *dentry);
78
79#endif /* _TRACEFS_INTERNAL_H */

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _TRACEFS_INTERNAL_H
 3#define _TRACEFS_INTERNAL_H
 4
 5enum {
 6	TRACEFS_EVENT_INODE		= BIT(1),
 7	TRACEFS_EVENT_TOP_INODE		= BIT(2),
 8	TRACEFS_GID_PERM_SET		= BIT(3),
 9	TRACEFS_UID_PERM_SET		= BIT(4),
10	TRACEFS_INSTANCE_INODE		= BIT(5),
11};
12
13struct tracefs_inode {
14	struct inode            vfs_inode;
15	/* The below gets initialized with memset_after(ti, 0, vfs_inode) */
 
16	unsigned long           flags;
17	void                    *private;
18};
19
20/*
21 * struct eventfs_attr - cache the mode and ownership of a eventfs entry
22 * @mode:	saved mode plus flags of what is saved
23 * @uid:	saved uid if changed
24 * @gid:	saved gid if changed
25 */
26struct eventfs_attr {
27	int				mode;
28	kuid_t				uid;
29	kgid_t				gid;
30};
31
32/*
33 * struct eventfs_inode - hold the properties of the eventfs directories.
34 * @list:	link list into the parent directory
35 * @rcu:	Union with @list for freeing
36 * @children:	link list into the child eventfs_inode
37 * @entries:	the array of entries representing the files in the directory
38 * @name:	the name of the directory to create
39 * @events_dir: the dentry of the events directory
40 * @entry_attrs: Saved mode and ownership of the @d_children
41 * @data:	The private data to pass to the callbacks
42 * @attr:	Saved mode and ownership of eventfs_inode itself
43 * @is_freed:	Flag set if the eventfs is on its way to be freed
44 *                Note if is_freed is set, then dentry is corrupted.
45 * @is_events:	Flag set for only the top level "events" directory
46 * @nr_entries: The number of items in @entries
47 * @ino:	The saved inode number
48 */
49struct eventfs_inode {
50	union {
51		struct list_head	list;
52		struct rcu_head		rcu;
53	};
54	struct list_head		children;
55	const struct eventfs_entry	*entries;
56	const char			*name;
57	struct dentry			*events_dir;
58	struct eventfs_attr		*entry_attrs;
59	void				*data;
60	struct eventfs_attr		attr;
61	struct kref			kref;
62	unsigned int			is_freed:1;
63	unsigned int			is_events:1;
64	unsigned int			nr_entries:30;
65	unsigned int			ino;
66};
67
68static inline struct tracefs_inode *get_tracefs(const struct inode *inode)
69{
70	return container_of(inode, struct tracefs_inode, vfs_inode);
71}
72
73struct dentry *tracefs_start_creating(const char *name, struct dentry *parent);
74struct dentry *tracefs_end_creating(struct dentry *dentry);
75struct dentry *tracefs_failed_creating(struct dentry *dentry);
76struct inode *tracefs_get_inode(struct super_block *sb);
77
 
78void eventfs_d_release(struct dentry *dentry);
79
80#endif /* _TRACEFS_INTERNAL_H */