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-rw-r--r--fs/xfs/xfs_hooks.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/fs/xfs/xfs_hooks.c b/fs/xfs/xfs_hooks.c
new file mode 100644
index 0000000000..a58d1de2d3
--- /dev/null
+++ b/fs/xfs/xfs_hooks.c
@@ -0,0 +1,52 @@
+// 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.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);
+}