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_set_children_dentry_flags(struct inode *inode);
97
98 extern struct kmem_cache *fsnotify_mark_connector_cachep;
99
100 #endif /* __FS_NOTIFY_FSNOTIFY_H_ */
101
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