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_GID_PERM_SET		= BIT(2),
 8	TRACEFS_UID_PERM_SET		= BIT(3),
 9	TRACEFS_INSTANCE_INODE		= BIT(4),
10};
11
12struct tracefs_inode {
13	union {
14		struct inode            vfs_inode;
15		struct rcu_head		rcu;
16	};
17	/* The below gets initialized with memset_after(ti, 0, vfs_inode) */
18	struct list_head	list;
19	unsigned long           flags;
20	void                    *private;
21};
22
23/*
24 * struct eventfs_attr - cache the mode and ownership of a eventfs entry
25 * @mode:	saved mode plus flags of what is saved
26 * @uid:	saved uid if changed
27 * @gid:	saved gid if changed
28 */
29struct eventfs_attr {
30	int				mode;
31	kuid_t				uid;
32	kgid_t				gid;
33};
34
35/*
36 * struct eventfs_inode - hold the properties of the eventfs directories.
37 * @list:	link list into the parent directory
38 * @rcu:	Union with @list for freeing
39 * @children:	link list into the child eventfs_inode
40 * @entries:	the array of entries representing the files in the directory
41 * @name:	the name of the directory to create
42 * @entry_attrs: Saved mode and ownership of the @d_children
43 * @data:	The private data to pass to the callbacks
44 * @attr:	Saved mode and ownership of eventfs_inode itself
45 * @is_freed:	Flag set if the eventfs is on its way to be freed
46 *                Note if is_freed is set, then dentry is corrupted.
47 * @is_events:	Flag set for only the top level "events" directory
48 * @nr_entries: The number of items in @entries
49 * @ino:	The saved inode number
50 */
51struct eventfs_inode {
52	union {
53		struct list_head	list;
54		struct rcu_head		rcu;
55	};
56	struct list_head		children;
57	const struct eventfs_entry	*entries;
58	const char			*name;
59	struct eventfs_attr		*entry_attrs;
60	void				*data;
61	struct eventfs_attr		attr;
62	struct kref			kref;
63	unsigned int			is_freed:1;
64	unsigned int			is_events:1;
65	unsigned int			nr_entries:30;
66	unsigned int			ino;
67};
68
69static inline struct tracefs_inode *get_tracefs(const struct inode *inode)
70{
71	return container_of(inode, struct tracefs_inode, vfs_inode);
72}
73
74struct dentry *tracefs_start_creating(const char *name, struct dentry *parent);
75struct dentry *tracefs_end_creating(struct dentry *dentry);
76struct dentry *tracefs_failed_creating(struct dentry *dentry);
77struct inode *tracefs_get_inode(struct super_block *sb);
78
79void eventfs_remount(struct tracefs_inode *ti, bool update_uid, bool update_gid);
80void eventfs_d_release(struct dentry *dentry);
81
82#endif /* _TRACEFS_INTERNAL_H */