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-rw-r--r--drivers/md/dm-vdo/completion.h152
1 files changed, 152 insertions, 0 deletions
diff --git a/drivers/md/dm-vdo/completion.h b/drivers/md/dm-vdo/completion.h
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+++ b/drivers/md/dm-vdo/completion.h
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+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright 2023 Red Hat
+ */
+
+#ifndef VDO_COMPLETION_H
+#define VDO_COMPLETION_H
+
+#include "permassert.h"
+
+#include "status-codes.h"
+#include "types.h"
+
+/**
+ * vdo_run_completion() - Run a completion's callback or error handler on the current thread.
+ *
+ * Context: This function must be called from the correct callback thread.
+ */
+static inline void vdo_run_completion(struct vdo_completion *completion)
+{
+ if ((completion->result != VDO_SUCCESS) && (completion->error_handler != NULL)) {
+ completion->error_handler(completion);
+ return;
+ }
+
+ completion->callback(completion);
+}
+
+void vdo_set_completion_result(struct vdo_completion *completion, int result);
+
+void vdo_initialize_completion(struct vdo_completion *completion, struct vdo *vdo,
+ enum vdo_completion_type type);
+
+/**
+ * vdo_reset_completion() - Reset a completion to a clean state, while keeping the type, vdo and
+ * parent information.
+ */
+static inline void vdo_reset_completion(struct vdo_completion *completion)
+{
+ completion->result = VDO_SUCCESS;
+ completion->complete = false;
+}
+
+void vdo_launch_completion_with_priority(struct vdo_completion *completion,
+ enum vdo_completion_priority priority);
+
+/**
+ * vdo_launch_completion() - Launch a completion with default priority.
+ */
+static inline void vdo_launch_completion(struct vdo_completion *completion)
+{
+ vdo_launch_completion_with_priority(completion, VDO_WORK_Q_DEFAULT_PRIORITY);
+}
+
+/**
+ * vdo_continue_completion() - Continue processing a completion.
+ * @result: The current result (will not mask older errors).
+ *
+ * Continue processing a completion by setting the current result and calling
+ * vdo_launch_completion().
+ */
+static inline void vdo_continue_completion(struct vdo_completion *completion, int result)
+{
+ vdo_set_completion_result(completion, result);
+ vdo_launch_completion(completion);
+}
+
+void vdo_finish_completion(struct vdo_completion *completion);
+
+/**
+ * vdo_fail_completion() - Set the result of a completion if it does not already have an error,
+ * then finish it.
+ */
+static inline void vdo_fail_completion(struct vdo_completion *completion, int result)
+{
+ vdo_set_completion_result(completion, result);
+ vdo_finish_completion(completion);
+}
+
+/**
+ * vdo_assert_completion_type() - Assert that a completion is of the correct type.
+ *
+ * Return: VDO_SUCCESS or an error
+ */
+static inline int vdo_assert_completion_type(struct vdo_completion *completion,
+ enum vdo_completion_type expected)
+{
+ return VDO_ASSERT(expected == completion->type,
+ "completion type should be %u, not %u", expected,
+ completion->type);
+}
+
+static inline void vdo_set_completion_callback(struct vdo_completion *completion,
+ vdo_action_fn callback,
+ thread_id_t callback_thread_id)
+{
+ completion->callback = callback;
+ completion->callback_thread_id = callback_thread_id;
+}
+
+/**
+ * vdo_launch_completion_callback() - Set the callback for a completion and launch it immediately.
+ */
+static inline void vdo_launch_completion_callback(struct vdo_completion *completion,
+ vdo_action_fn callback,
+ thread_id_t callback_thread_id)
+{
+ vdo_set_completion_callback(completion, callback, callback_thread_id);
+ vdo_launch_completion(completion);
+}
+
+/**
+ * vdo_prepare_completion() - Prepare a completion for launch.
+ *
+ * Resets the completion, and then sets its callback, error handler, callback thread, and parent.
+ */
+static inline void vdo_prepare_completion(struct vdo_completion *completion,
+ vdo_action_fn callback,
+ vdo_action_fn error_handler,
+ thread_id_t callback_thread_id, void *parent)
+{
+ vdo_reset_completion(completion);
+ vdo_set_completion_callback(completion, callback, callback_thread_id);
+ completion->error_handler = error_handler;
+ completion->parent = parent;
+}
+
+/**
+ * vdo_prepare_completion_for_requeue() - Prepare a completion for launch ensuring that it will
+ * always be requeued.
+ *
+ * Resets the completion, and then sets its callback, error handler, callback thread, and parent.
+ */
+static inline void vdo_prepare_completion_for_requeue(struct vdo_completion *completion,
+ vdo_action_fn callback,
+ vdo_action_fn error_handler,
+ thread_id_t callback_thread_id,
+ void *parent)
+{
+ vdo_prepare_completion(completion, callback, error_handler,
+ callback_thread_id, parent);
+ completion->requeue = true;
+}
+
+void vdo_enqueue_completion(struct vdo_completion *completion,
+ enum vdo_completion_priority priority);
+
+
+bool vdo_requeue_completion_if_needed(struct vdo_completion *completion,
+ thread_id_t callback_thread_id);
+
+#endif /* VDO_COMPLETION_H */