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 union { 15 struct inode vfs_inode; 16 struct rcu_head rcu; 17 }; 18 /* The below gets initialized with memset_after(ti, 0, vfs_inode) */ 19 struct list_head list; 20 unsigned long flags; 21 void *private; 22 }; 23 24 /* 25 * struct eventfs_attr - cache the mode and ownership of a eventfs entry 26 * @mode: saved mode plus flags of what is saved 27 * @uid: saved uid if changed 28 * @gid: saved gid if changed 29 */ 30 struct eventfs_attr { 31 int mode; 32 kuid_t uid; 33 kgid_t gid; 34 }; 35 36 /* 37 * struct eventfs_inode - hold the properties of the eventfs directories. 38 * @list: link list into the parent directory 39 * @rcu: Union with @list for freeing 40 * @children: link list into the child eventfs_inode 41 * @entries: the array of entries representing the files in the directory 42 * @name: the name of the directory to create 43 * @events_dir: the dentry of the events directory 44 * @entry_attrs: Saved mode and ownership of the @d_children 45 * @data: The private data to pass to the callbacks 46 * @attr: Saved mode and ownership of eventfs_inode itself 47 * @is_freed: Flag set if the eventfs is on its way to be freed 48 * Note if is_freed is set, then dentry is corrupted. 49 * @is_events: Flag set for only the top level "events" directory 50 * @nr_entries: The number of items in @entries 51 * @ino: The saved inode number 52 */ 53 struct eventfs_inode { 54 union { 55 struct list_head list; 56 struct rcu_head rcu; 57 }; 58 struct list_head children; 59 const struct eventfs_entry *entries; 60 const char *name; 61 struct dentry *events_dir; 62 struct eventfs_attr *entry_attrs; 63 void *data; 64 struct eventfs_attr attr; 65 struct kref kref; 66 unsigned int is_freed:1; 67 unsigned int is_events:1; 68 unsigned int nr_entries:30; 69 unsigned int ino; 70 }; 71 72 static inline struct tracefs_inode *get_tracefs(const struct inode *inode) 73 { 74 return container_of(inode, struct tracefs_inode, vfs_inode); 75 } 76 77 struct dentry *tracefs_start_creating(const char *name, struct dentry *parent); 78 struct dentry *tracefs_end_creating(struct dentry *dentry); 79 struct dentry *tracefs_failed_creating(struct dentry *dentry); 80 struct inode *tracefs_get_inode(struct super_block *sb); 81 82 void eventfs_remount(struct tracefs_inode *ti, bool update_uid, bool update_gid); 83 void eventfs_d_release(struct dentry *dentry); 84 85 #endif /* _TRACEFS_INTERNAL_H */ 86