kernel: advanced buffer cache

kernel-src/include/kernel/abc.h

@@ -0,0 +1,43 @@
+#ifndef _ABC_H
+#define _ABC_H
+
+#include <list.h>
+#include <stdbool.h>
+#include <trie.h>
+#include <mutex.h>
+#include <kernel/vfs.h>
+#include <kernel/thread.h>
+#include <kernel/event.h>
+
+#define ABC_BLOCK_FLAGS_DIRTY 1
+#define ABC_BLOCK_FLAGS_BUSY 2
+typedef struct {
+	list_node_t dirty_list_node;
+	uint64_t block;
+	void *data;
+	size_t refcount;
+	int flags;
+} abc_block_t;
+
+typedef struct {
+	mutex_t mutex; // TODO: use pushlock properly here once pushlock rewrite is known good
+	trie_t blocks;
+	size_t block_size;
+
+	mutex_t dirty_list_mutex;
+	list_t dirty_list;
+	bool syncing;
+	eventheader_t dirty_list_sync_event;
+	eventheader_t dirty_list_empty_event;
+
+	vnode_t *backing;
+	thread_t *writer;
+} abc_t;
+
+int abc_init(abc_t *abc, vnode_t *vnode, size_t block_size);
+int abc_get_block(abc_t *abc, uint64_t block, abc_block_t **ret);
+void abc_make_dirty(abc_t *abc, abc_block_t *block);
+void abc_sync(abc_t *abc);
+void abc_release_block(abc_t *abc, abc_block_t *abc_block);
+
+#endif