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1#ifndef __FS_NOTIFY_FSNOTIFY_H_
2#define __FS_NOTIFY_FSNOTIFY_H_
3
4#include <linux/list.h>
5#include <linux/fsnotify.h>
6#include <linux/srcu.h>
7#include <linux/types.h>
8
9#include "../mount.h"
10
11/* destroy all events sitting in this groups notification queue */
12extern void fsnotify_flush_notify(struct fsnotify_group *group);
13
14/* protects reads of inode and vfsmount marks list */
15extern struct srcu_struct fsnotify_mark_srcu;
16
17/* Calculate mask of events for a list of marks */
18extern u32 fsnotify_recalc_mask(struct hlist_head *head);
19
20/* compare two groups for sorting of marks lists */
21extern int fsnotify_compare_groups(struct fsnotify_group *a,
22 struct fsnotify_group *b);
23
24extern void fsnotify_set_inode_mark_mask_locked(struct fsnotify_mark *fsn_mark,
25 __u32 mask);
26/* Add mark to a proper place in mark list */
27extern int fsnotify_add_mark_list(struct hlist_head *head,
28 struct fsnotify_mark *mark,
29 int allow_dups);
30/* add a mark to an inode */
31extern int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
32 struct fsnotify_group *group, struct inode *inode,
33 int allow_dups);
34/* add a mark to a vfsmount */
35extern int fsnotify_add_vfsmount_mark(struct fsnotify_mark *mark,
36 struct fsnotify_group *group, struct vfsmount *mnt,
37 int allow_dups);
38
39/* vfsmount specific destruction of a mark */
40extern void fsnotify_destroy_vfsmount_mark(struct fsnotify_mark *mark);
41/* inode specific destruction of a mark */
42extern void fsnotify_destroy_inode_mark(struct fsnotify_mark *mark);
43/* Find mark belonging to given group in the list of marks */
44extern struct fsnotify_mark *fsnotify_find_mark(struct hlist_head *head,
45 struct fsnotify_group *group);
46/* Destroy all marks in the given list protected by 'lock' */
47extern void fsnotify_destroy_marks(struct hlist_head *head, spinlock_t *lock);
48/* run the list of all marks associated with inode and destroy them */
49static inline void fsnotify_clear_marks_by_inode(struct inode *inode)
50{
51 fsnotify_destroy_marks(&inode->i_fsnotify_marks, &inode->i_lock);
52}
53/* run the list of all marks associated with vfsmount and destroy them */
54static inline void fsnotify_clear_marks_by_mount(struct vfsmount *mnt)
55{
56 fsnotify_destroy_marks(&real_mount(mnt)->mnt_fsnotify_marks,
57 &mnt->mnt_root->d_lock);
58}
59/*
60 * update the dentry->d_flags of all of inode's children to indicate if inode cares
61 * about events that happen to its children.
62 */
63extern void __fsnotify_update_child_dentry_flags(struct inode *inode);
64
65/* allocate and destroy and event holder to attach events to notification/access queues */
66extern struct fsnotify_event_holder *fsnotify_alloc_event_holder(void);
67extern void fsnotify_destroy_event_holder(struct fsnotify_event_holder *holder);
68
69#endif /* __FS_NOTIFY_FSNOTIFY_H_ */
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 */
16typedef struct fsnotify_mark_connector __rcu *fsnotify_connp_t;
17
18static inline struct inode *fsnotify_conn_inode(
19 struct fsnotify_mark_connector *conn)
20{
21 return conn->obj;
22}
23
24static inline struct mount *fsnotify_conn_mount(
25 struct fsnotify_mark_connector *conn)
26{
27 return real_mount(conn->obj);
28}
29
30static inline struct super_block *fsnotify_conn_sb(
31 struct fsnotify_mark_connector *conn)
32{
33 return conn->obj;
34}
35
36static 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
51static 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
57static 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 */
65extern void fsnotify_flush_notify(struct fsnotify_group *group);
66
67/* protects reads of inode and vfsmount marks list */
68extern struct srcu_struct fsnotify_mark_srcu;
69
70/* compare two groups for sorting of marks lists */
71extern int fsnotify_compare_groups(struct fsnotify_group *a,
72 struct fsnotify_group *b);
73
74/* Destroy all marks attached to an object via connector */
75extern void fsnotify_destroy_marks(fsnotify_connp_t *connp);
76/* run the list of all marks associated with inode and destroy them */
77static 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 */
82static 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 */
87static 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 */
96extern void fsnotify_set_children_dentry_flags(struct inode *inode);
97
98extern struct kmem_cache *fsnotify_mark_connector_cachep;
99
100#endif /* __FS_NOTIFY_FSNOTIFY_H_ */