初步实现bfs原型（仅用于实验）

internal/utils/bfs/fs_options.go

@@ -0,0 +1,34 @@
+// Copyright 2024 GoEdge CDN goedge.cdn@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package bfs
+
+import "time"
+
+type FSOptions struct {
+	MaxOpenFiles int // TODO 需要实现
+	BytesPerSync int64
+	SyncTimeout  time.Duration
+	MaxSyncFiles int
+}
+
+func (this *FSOptions) EnsureDefaults() {
+	if this.MaxOpenFiles <= 0 {
+		this.MaxOpenFiles = 4 << 10
+	}
+	if this.BytesPerSync <= 0 {
+		this.BytesPerSync = 1 << 20 // TODO 根据硬盘实际写入速度进行调整
+	}
+	if this.SyncTimeout <= 0 {
+		this.SyncTimeout = 1 * time.Second
+	}
+	if this.MaxSyncFiles <= 0 {
+		this.MaxSyncFiles = 32
+	}
+}
+
+var DefaultFSOptions = &FSOptions{
+	MaxOpenFiles: 4 << 10,
+	BytesPerSync: 1 << 20, // TODO 根据硬盘实际写入速度进行调整
+	SyncTimeout:  1 * time.Second,
+	MaxSyncFiles: 32,
+}