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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 */