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 }; 9 10 struct tracefs_inode { 11 unsigned long flags; 12 void *private; 13 struct inode vfs_inode; 14 }; 15 16 /* 17 * struct eventfs_attr - cache the mode and ownership of a eventfs entry 18 * @mode: saved mode plus flags of what is saved 19 * @uid: saved uid if changed 20 * @gid: saved gid if changed 21 */ 22 struct eventfs_attr { 23 int mode; 24 kuid_t uid; 25 kgid_t gid; 26 }; 27 28 /* 29 * struct eventfs_inode - hold the properties of the eventfs directories. 30 * @list: link list into the parent directory 31 * @entries: the array of entries representing the files in the directory 32 * @name: the name of the directory to create 33 * @children: link list into the child eventfs_inode 34 * @dentry: the dentry of the directory 35 * @d_parent: pointer to the parent's dentry 36 * @d_children: The array of dentries to represent the files when created 37 * @entry_attrs: Saved mode and ownership of the @d_children 38 * @attr: Saved mode and ownership of eventfs_inode itself 39 * @data: The private data to pass to the callbacks 40 * @is_freed: Flag set if the eventfs is on its way to be freed 41 * Note if is_freed is set, then dentry is corrupted. 42 * @nr_entries: The number of items in @entries 43 */ 44 struct eventfs_inode { 45 struct list_head list; 46 const struct eventfs_entry *entries; 47 const char *name; 48 struct list_head children; 49 struct dentry *dentry; /* Check is_freed to access */ 50 struct dentry *d_parent; 51 struct dentry **d_children; 52 struct eventfs_attr *entry_attrs; 53 struct eventfs_attr attr; 54 void *data; 55 /* 56 * Union - used for deletion 57 * @llist: for calling dput() if needed after RCU 58 * @rcu: eventfs_inode to delete in RCU 59 */ 60 union { 61 struct llist_node llist; 62 struct rcu_head rcu; 63 }; 64 unsigned int is_freed:1; 65 unsigned int is_events:1; 66 unsigned int nr_entries:30; 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 struct dentry *eventfs_start_creating(const char *name, struct dentry *parent); 79 struct dentry *eventfs_failed_creating(struct dentry *dentry); 80 struct dentry *eventfs_end_creating(struct dentry *dentry); 81 void eventfs_update_gid(struct dentry *dentry, kgid_t gid); 82 void eventfs_set_ei_status_free(struct tracefs_inode *ti, struct dentry *dentry); 83 84 #endif /* _TRACEFS_INTERNAL_H */ 85