blob: 3f958ece0dc09e8573804c4ecbee477ee48728c8 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2022 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <djwong@kernel.org>
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_ag.h"
#include "xfs_trace.h"
/* Initialize a notifier chain. */
void
xfs_hooks_init(
struct xfs_hooks *chain)
{
srcu_init_notifier_head(&chain->head);
}
/* Make it so a function gets called whenever we hit a certain hook point. */
int
xfs_hooks_add(
struct xfs_hooks *chain,
struct xfs_hook *hook)
{
ASSERT(hook->nb.notifier_call != NULL);
BUILD_BUG_ON(offsetof(struct xfs_hook, nb) != 0);
return srcu_notifier_chain_register(&chain->head, &hook->nb);
}
/* Remove a previously installed hook. */
void
xfs_hooks_del(
struct xfs_hooks *chain,
struct xfs_hook *hook)
{
srcu_notifier_chain_unregister(&chain->head, &hook->nb);
rcu_barrier();
}
/* Call a hook. Returns the NOTIFY_* value returned by the last hook. */
int
xfs_hooks_call(
struct xfs_hooks *chain,
unsigned long val,
void *priv)
{
return srcu_notifier_call_chain(&chain->head, val, priv);
}
|
