Line data    Source code

       1             : // SPDX-License-Identifier: GPL-2.0-or-later
       2             : /*
       3             :  * Copyright (C) 2022-2023 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             : #if defined(CONFIG_XFS_LIVE_HOOKS_SRCU)
      16             : /* Initialize a notifier chain. */
      17             : void
      18             : xfs_hooks_init(
      19             :         struct xfs_hooks        *chain)
      20             : {
      21             :         srcu_init_notifier_head(&chain->head);
      22             : }
      23             : 
      24             : /* Make it so a function gets called whenever we hit a certain hook point. */
      25             : int
      26             : xfs_hooks_add(
      27             :         struct xfs_hooks        *chain,
      28             :         struct xfs_hook         *hook)
      29             : {
      30             :         ASSERT(hook->nb.notifier_call != NULL);
      31             :         BUILD_BUG_ON(offsetof(struct xfs_hook, nb) != 0);
      32             : 
      33             :         return srcu_notifier_chain_register(&chain->head, &hook->nb);
      34             : }
      35             : 
      36             : /* Remove a previously installed hook. */
      37             : void
      38             : xfs_hooks_del(
      39             :         struct xfs_hooks        *chain,
      40             :         struct xfs_hook         *hook)
      41             : {
      42             :         srcu_notifier_chain_unregister(&chain->head, &hook->nb);
      43             :         rcu_barrier();
      44             : }
      45             : 
      46             : /* Call a hook.  Returns the NOTIFY_* value returned by the last hook. */
      47             : int
      48             : xfs_hooks_call(
      49             :         struct xfs_hooks        *chain,
      50             :         unsigned long           val,
      51             :         void                    *priv)
      52             : {
      53             :         return srcu_notifier_call_chain(&chain->head, val, priv);
      54             : }
      55             : #elif defined(CONFIG_XFS_LIVE_HOOKS_BLOCKING)
      56             : /* Initialize a notifier chain. */
      57             : void
      58      827509 : xfs_hooks_init(
      59             :         struct xfs_hooks        *chain)
      60             : {
      61      827509 :         BLOCKING_INIT_NOTIFIER_HEAD(&chain->head);
      62      827509 : }
      63             : 
      64             : /* Make it so a function gets called whenever we hit a certain hook point. */
      65             : int
      66    23603760 : xfs_hooks_add(
      67             :         struct xfs_hooks        *chain,
      68             :         struct xfs_hook         *hook)
      69             : {
      70    23603760 :         ASSERT(hook->nb.notifier_call != NULL);
      71    23603760 :         BUILD_BUG_ON(offsetof(struct xfs_hook, nb) != 0);
      72             : 
      73    23603760 :         return blocking_notifier_chain_register(&chain->head, &hook->nb);
      74             : }
      75             : 
      76             : /* Remove a previously installed hook. */
      77             : void
      78    23702077 : xfs_hooks_del(
      79             :         struct xfs_hooks        *chain,
      80             :         struct xfs_hook         *hook)
      81             : {
      82    23702077 :         blocking_notifier_chain_unregister(&chain->head, &hook->nb);
      83    23781333 : }
      84             : 
      85             : /* Call a hook.  Returns the NOTIFY_* value returned by the last hook. */
      86             : int
      87   229393805 : xfs_hooks_call(
      88             :         struct xfs_hooks        *chain,
      89             :         unsigned long           val,
      90             :         void                    *priv)
      91             : {
      92   229393805 :         return blocking_notifier_call_chain(&chain->head, val, priv);
      93             : }
      94             : #endif /* CONFIG_XFS_LIVE_HOOKS_BLOCKING */