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 marks attached to an object via connector */
81 extern void fsnotify_destroy_marks(fsnotify_connp_t *connp);
82 /* run the list of all marks associated with inode and destroy them */
83 static inline void fsnotify_clear_marks_by_inode(struct inode *inode)
84 {
85 	fsnotify_destroy_marks(&inode->i_fsnotify_marks);
86 }
87 /* run the list of all marks associated with vfsmount and destroy them */
88 static inline void fsnotify_clear_marks_by_mount(struct vfsmount *mnt)
89 {
90 	fsnotify_destroy_marks(&real_mount(mnt)->mnt_fsnotify_marks);
91 }
92 /* run the list of all marks associated with sb and destroy them */
93 static inline void fsnotify_clear_marks_by_sb(struct super_block *sb)
94 {
95 	fsnotify_destroy_marks(fsnotify_sb_marks(sb));
96 }
97 
98 static inline void fsnotify_clear_marks_by_mntns(struct mnt_namespace *mntns)
99 {
100 	fsnotify_destroy_marks(&mntns->n_fsnotify_marks);
101 }
102 
103 /*
104  * update the dentry->d_flags of all of inode's children to indicate if inode cares
105  * about events that happen to its children.
106  */
107 extern void fsnotify_set_children_dentry_flags(struct inode *inode);
108 
109 extern struct kmem_cache *fsnotify_mark_connector_cachep;
110 
111 #endif	/* __FS_NOTIFY_FSNOTIFY_H_ */
112