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// 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"
#if defined(CONFIG_XFS_LIVE_HOOKS_SRCU)
/* 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);
}
#elif defined(CONFIG_XFS_LIVE_HOOKS_BLOCKING)
/* 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);
}
#endif /* CONFIG_XFS_LIVE_HOOKS_BLOCKING */
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