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 */
80

source code of linux/fs/tracefs/internal.h