1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _TRACEFS_INTERNAL_H
3 #define _TRACEFS_INTERNAL_H
4
5 enum {
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
13 struct 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 */
26 struct 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 */
49 struct 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
get_tracefs(const struct inode * inode)68 static inline struct tracefs_inode *get_tracefs(const struct inode *inode)
69 {
70 return container_of(inode, struct tracefs_inode, vfs_inode);
71 }
72
73 struct dentry *tracefs_start_creating(const char *name, struct dentry *parent);
74 struct dentry *tracefs_end_creating(struct dentry *dentry);
75 struct dentry *tracefs_failed_creating(struct dentry *dentry);
76 struct inode *tracefs_get_inode(struct super_block *sb);
77
78 void eventfs_d_release(struct dentry *dentry);
79
80 #endif /* _TRACEFS_INTERNAL_H */
81