fs/xfs/xfs_hooks.c

Source file repositories/reference/linux-study-clean/fs/xfs/xfs_hooks.c

File Facts

System
Linux kernel
Corpus path
fs/xfs/xfs_hooks.c
Extension
.c
Size
1192 bytes
Lines
53
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (c) 2022-2024 Oracle.  All Rights Reserved.
 * Author: Darrick J. Wong <djwong@kernel.org>
 */
#include "xfs_platform.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)
{
	BLOCKING_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 blocking_notifier_chain_register(&chain->head, &hook->nb);
}

/* Remove a previously installed hook. */
void
xfs_hooks_del(
	struct xfs_hooks	*chain,
	struct xfs_hook		*hook)
{
	blocking_notifier_chain_unregister(&chain->head, &hook->nb);
}

/* 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 blocking_notifier_call_chain(&chain->head, val, priv);
}

Annotation

Implementation Notes