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 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