WSL 的 ext4.vhdx 占满 C 盘：只涨不缩问题的分析与解决
Windows 报磁盘告警，1.4T 的 C 盘只剩 20MB，而 WSL 里实际只用了 272GB。中间踩到两个坑：稀疏 VHD 已被微软禁用，以及 wsl --shutdown 并不会释放 vhdx 的文件句柄。
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