支持预分配文件

[xixky]

Description(required)

希望可以和aria2一样，设置里面可以设置预分配文件的方式。 https://github.com/GopeedLab/gopeed/blob/8b3b5d4394df67dad87bccfb335843308d95df86/internal/controller/controller.go#L42

使用fallocate

cmd := exec.Command("fallocate", "-l", “1G”,name)

使用truncate

cmd := exec.Command("truncate", "-s", “1G”,name)

App Version(required)

OS Version(required)

linux

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