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_GID_PERM_SET = BIT(2), 8 TRACEFS_UID_PERM_SET = BIT(3), 9 TRACEFS_INSTANCE_INODE = BIT(4), 10 }; 11 12 struct 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 */ 29 struct 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 */ 51 struct 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 69 static inline struct tracefs_inode *get_tracefs(const struct inode *inode) 70 { 71 return container_of(inode, struct tracefs_inode, vfs_inode); 72 } 73 74 struct dentry *tracefs_start_creating(const char *name, struct dentry *parent); 75 struct dentry *tracefs_end_creating(struct dentry *dentry); 76 struct dentry *tracefs_failed_creating(struct dentry *dentry); 77 struct inode *tracefs_get_inode(struct super_block *sb); 78 79 void eventfs_remount(struct tracefs_inode *ti, bool update_uid, bool update_gid); 80 void eventfs_d_release(struct dentry *dentry); 81 82 #endif /* _TRACEFS_INTERNAL_H */ 83