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-rw-r--r--drivers/md/dm-vdo/indexer/open-chapter.h79
1 files changed, 79 insertions, 0 deletions
diff --git a/drivers/md/dm-vdo/indexer/open-chapter.h b/drivers/md/dm-vdo/indexer/open-chapter.h
new file mode 100644
index 0000000000..a4250bb195
--- /dev/null
+++ b/drivers/md/dm-vdo/indexer/open-chapter.h
@@ -0,0 +1,79 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright 2023 Red Hat
+ */
+
+#ifndef UDS_OPEN_CHAPTER_H
+#define UDS_OPEN_CHAPTER_H
+
+#include "chapter-index.h"
+#include "geometry.h"
+#include "index.h"
+#include "volume.h"
+
+/*
+ * The open chapter tracks the newest records in memory. Like the index as a whole, each open
+ * chapter is divided into a number of independent zones which are interleaved when the chapter is
+ * committed to the volume.
+ */
+
+enum {
+ OPEN_CHAPTER_RECORD_NUMBER_BITS = 23,
+};
+
+struct open_chapter_zone_slot {
+ /* If non-zero, the record number addressed by this hash slot */
+ unsigned int record_number : OPEN_CHAPTER_RECORD_NUMBER_BITS;
+ /* If true, the record at the index of this hash slot was deleted */
+ bool deleted : 1;
+} __packed;
+
+struct open_chapter_zone {
+ /* The maximum number of records that can be stored */
+ unsigned int capacity;
+ /* The number of records stored */
+ unsigned int size;
+ /* The number of deleted records */
+ unsigned int deletions;
+ /* Array of chunk records, 1-based */
+ struct uds_volume_record *records;
+ /* The number of slots in the hash table */
+ unsigned int slot_count;
+ /* The hash table slots, referencing virtual record numbers */
+ struct open_chapter_zone_slot slots[];
+};
+
+int __must_check uds_make_open_chapter(const struct index_geometry *geometry,
+ unsigned int zone_count,
+ struct open_chapter_zone **open_chapter_ptr);
+
+void uds_reset_open_chapter(struct open_chapter_zone *open_chapter);
+
+void uds_search_open_chapter(struct open_chapter_zone *open_chapter,
+ const struct uds_record_name *name,
+ struct uds_record_data *metadata, bool *found);
+
+int __must_check uds_put_open_chapter(struct open_chapter_zone *open_chapter,
+ const struct uds_record_name *name,
+ const struct uds_record_data *metadata);
+
+void uds_remove_from_open_chapter(struct open_chapter_zone *open_chapter,
+ const struct uds_record_name *name);
+
+void uds_free_open_chapter(struct open_chapter_zone *open_chapter);
+
+int __must_check uds_close_open_chapter(struct open_chapter_zone **chapter_zones,
+ unsigned int zone_count, struct volume *volume,
+ struct open_chapter_index *chapter_index,
+ struct uds_volume_record *collated_records,
+ u64 virtual_chapter_number);
+
+int __must_check uds_save_open_chapter(struct uds_index *index,
+ struct buffered_writer *writer);
+
+int __must_check uds_load_open_chapter(struct uds_index *index,
+ struct buffered_reader *reader);
+
+u64 uds_compute_saved_open_chapter_size(struct index_geometry *geometry);
+
+#endif /* UDS_OPEN_CHAPTER_H */