1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __FS_NOTIFY_FSNOTIFY_H_ 3 #define __FS_NOTIFY_FSNOTIFY_H_ 4 5 #include <linux/list.h> 6 #include <linux/fsnotify.h> 7 #include <linux/srcu.h> 8 #include <linux/types.h> 9 10 #include "../mount.h" 11 12 /* 13 * fsnotify_connp_t is what we embed in objects which connector can be attached 14 * to. 15 */ 16 typedef struct fsnotify_mark_connector __rcu *fsnotify_connp_t; 17 18 static inline struct inode *fsnotify_conn_inode( 19 struct fsnotify_mark_connector *conn) 20 { 21 return conn->obj; 22 } 23 24 static inline struct mount *fsnotify_conn_mount( 25 struct fsnotify_mark_connector *conn) 26 { 27 return real_mount(conn->obj); 28 } 29 30 static inline struct super_block *fsnotify_conn_sb( 31 struct fsnotify_mark_connector *conn) 32 { 33 return conn->obj; 34 } 35 36 static inline struct super_block *fsnotify_object_sb(void *obj, 37 enum fsnotify_obj_type obj_type) 38 { 39 switch (obj_type) { 40 case FSNOTIFY_OBJ_TYPE_INODE: 41 return ((struct inode *)obj)->i_sb; 42 case FSNOTIFY_OBJ_TYPE_VFSMOUNT: 43 return ((struct vfsmount *)obj)->mnt_sb; 44 case FSNOTIFY_OBJ_TYPE_SB: 45 return (struct super_block *)obj; 46 default: 47 return NULL; 48 } 49 } 50 51 static inline struct super_block *fsnotify_connector_sb( 52 struct fsnotify_mark_connector *conn) 53 { 54 return fsnotify_object_sb(conn->obj, conn->type); 55 } 56 57 static inline fsnotify_connp_t *fsnotify_sb_marks(struct super_block *sb) 58 { 59 struct fsnotify_sb_info *sbinfo = fsnotify_sb_info(sb); 60 61 return sbinfo ? &sbinfo->sb_marks : NULL; 62 } 63 64 /* destroy all events sitting in this groups notification queue */ 65 extern void fsnotify_flush_notify(struct fsnotify_group *group); 66 67 /* protects reads of inode and vfsmount marks list */ 68 extern struct srcu_struct fsnotify_mark_srcu; 69 70 /* compare two groups for sorting of marks lists */ 71 extern int fsnotify_compare_groups(struct fsnotify_group *a, 72 struct fsnotify_group *b); 73 74 /* Destroy all marks attached to an object via connector */ 75 extern void fsnotify_destroy_marks(fsnotify_connp_t *connp); 76 /* run the list of all marks associated with inode and destroy them */ 77 static inline void fsnotify_clear_marks_by_inode(struct inode *inode) 78 { 79 fsnotify_destroy_marks(&inode->i_fsnotify_marks); 80 } 81 /* run the list of all marks associated with vfsmount and destroy them */ 82 static inline void fsnotify_clear_marks_by_mount(struct vfsmount *mnt) 83 { 84 fsnotify_destroy_marks(&real_mount(mnt)->mnt_fsnotify_marks); 85 } 86 /* run the list of all marks associated with sb and destroy them */ 87 static inline void fsnotify_clear_marks_by_sb(struct super_block *sb) 88 { 89 fsnotify_destroy_marks(fsnotify_sb_marks(sb)); 90 } 91 92 /* 93 * update the dentry->d_flags of all of inode's children to indicate if inode cares 94 * about events that happen to its children. 95 */ 96 extern void __fsnotify_update_child_dentry_flags(struct inode *inode); 97 98 extern struct kmem_cache *fsnotify_mark_connector_cachep; 99 100 #endif /* __FS_NOTIFY_FSNOTIFY_H_ */ 101