// 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); }