1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Copyright (c) 2022-2024 Oracle. All Rights Reserved. 4 * Author: Darrick J. Wong <djwong@kernel.org> 5 */ 6#include "xfs.h" 7#include "xfs_fs.h" 8#include "xfs_shared.h" 9#include "xfs_format.h" 10#include "xfs_trans_resv.h" 11#include "xfs_mount.h" 12#include "xfs_ag.h" 13#include "xfs_trace.h" 14 15/* Initialize a notifier chain. */ 16void 17xfs_hooks_init( 18 struct xfs_hooks *chain) 19{ 20 BLOCKING_INIT_NOTIFIER_HEAD(&chain->head); 21} 22 23/* Make it so a function gets called whenever we hit a certain hook point. */ 24int 25xfs_hooks_add( 26 struct xfs_hooks *chain, 27 struct xfs_hook *hook) 28{ 29 ASSERT(hook->nb.notifier_call != NULL); 30 BUILD_BUG_ON(offsetof(struct xfs_hook, nb) != 0); 31 32 return blocking_notifier_chain_register(&chain->head, &hook->nb); 33} 34 35/* Remove a previously installed hook. */ 36void 37xfs_hooks_del( 38 struct xfs_hooks *chain, 39 struct xfs_hook *hook) 40{ 41 blocking_notifier_chain_unregister(&chain->head, &hook->nb); 42} 43 44/* Call a hook. Returns the NOTIFY_* value returned by the last hook. */ 45int 46xfs_hooks_call( 47 struct xfs_hooks *chain, 48 unsigned long val, 49 void *priv) 50{ 51 return blocking_notifier_call_chain(&chain->head, val, priv); 52} 53