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 mnt_namespace *fsnotify_conn_mntns( 37 struct fsnotify_mark_connector *conn) 38 { 39 return conn->obj; 40 } 41 42 static inline struct super_block *fsnotify_object_sb(void *obj, 43 enum fsnotify_obj_type obj_type) 44 { 45 switch (obj_type) { 46 case FSNOTIFY_OBJ_TYPE_INODE: 47 return ((struct inode *)obj)->i_sb; 48 case FSNOTIFY_OBJ_TYPE_VFSMOUNT: 49 return ((struct vfsmount *)obj)->mnt_sb; 50 case FSNOTIFY_OBJ_TYPE_SB: 51 return (struct super_block *)obj; 52 default: 53 return NULL; 54 } 55 } 56 57 static inline struct super_block *fsnotify_connector_sb( 58 struct fsnotify_mark_connector *conn) 59 { 60 return fsnotify_object_sb(conn->obj, conn->type); 61 } 62 63 static inline fsnotify_connp_t *fsnotify_sb_marks(struct super_block *sb) 64 { 65 struct fsnotify_sb_info *sbinfo = fsnotify_sb_info(sb); 66 67 return sbinfo ? &sbinfo->sb_marks : NULL; 68 } 69 70 /* destroy all events sitting in this groups notification queue */ 71 extern void fsnotify_flush_notify(struct fsnotify_group *group); 72 73 /* protects reads of inode and vfsmount marks list */ 74 extern struct srcu_struct fsnotify_mark_srcu; 75 76 /* compare two groups for sorting of marks lists */ 77 extern int fsnotify_compare_groups(struct fsnotify_group *a, 78 struct fsnotify_group *b); 79 80 /* Destroy all inode marks for given superblock */ 81 void fsnotify_unmount_inodes(struct fsnotify_sb_info *sbinfo); 82 83 /* Destroy all marks attached to an object via connector */ 84 extern void fsnotify_destroy_marks(fsnotify_connp_t *connp); 85 /* run the list of all marks associated with inode and destroy them */ 86 static inline void fsnotify_clear_marks_by_inode(struct inode *inode) 87 { 88 fsnotify_destroy_marks(&inode->i_fsnotify_marks); 89 } 90 /* run the list of all marks associated with vfsmount and destroy them */ 91 static inline void fsnotify_clear_marks_by_mount(struct vfsmount *mnt) 92 { 93 fsnotify_destroy_marks(&real_mount(mnt)->mnt_fsnotify_marks); 94 } 95 /* run the list of all marks associated with sb and destroy them */ 96 static inline void fsnotify_clear_marks_by_sb(struct super_block *sb) 97 { 98 fsnotify_destroy_marks(fsnotify_sb_marks(sb)); 99 } 100 101 static inline void fsnotify_clear_marks_by_mntns(struct mnt_namespace *mntns) 102 { 103 fsnotify_destroy_marks(&mntns->n_fsnotify_marks); 104 } 105 106 /* 107 * update the dentry->d_flags of all of inode's children to indicate if inode cares 108 * about events that happen to its children. 109 */ 110 extern void fsnotify_set_children_dentry_flags(struct inode *inode); 111 112 void fsnotify_init_connector_caches(void); 113 114 #endif /* __FS_NOTIFY_FSNOTIFY_H_ */ 115