| 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. */ |
| 16 | void |
| 17 | xfs_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. */ |
| 24 | int |
| 25 | xfs_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(nh: &chain->head, nb: &hook->nb); |
| 33 | } |
| 34 | |
| 35 | /* Remove a previously installed hook. */ |
| 36 | void |
| 37 | xfs_hooks_del( |
| 38 | struct xfs_hooks *chain, |
| 39 | struct xfs_hook *hook) |
| 40 | { |
| 41 | blocking_notifier_chain_unregister(nh: &chain->head, nb: &hook->nb); |
| 42 | } |
| 43 | |
| 44 | /* Call a hook. Returns the NOTIFY_* value returned by the last hook. */ |
| 45 | int |
| 46 | xfs_hooks_call( |
| 47 | struct xfs_hooks *chain, |
| 48 | unsigned long val, |
| 49 | void *priv) |
| 50 | { |
| 51 | return blocking_notifier_call_chain(nh: &chain->head, val, v: priv); |
| 52 | } |
| 53 |