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操作系统2011作业&ccedi

操作系统2011作业&ccedi

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操作系统 (D ) 第七章作业解答 2011 1 操作系统第七章作业 1 什么是文件系统?文件系统的主要功能有哪些? 答:在操作系统中负责管理与存取文件信息的软件机构称为文件系统。 主要功能:完成文件存储空间的管理、实现文件名到物理地址的映射、实现文件和目录的操 作管理、提供文件共享能力和安全措施、提供用户接口。 2 什么是文件的逻辑结构?它有哪几种组织方式? 答:用户按自己对信息的使用要求组织文件,由于这种文件是独立于物理环境而构造的,所 以把用户概念中的文件称为文件的逻辑结构。 组织方式: 流式文件 记录式文件 3 文件的存取方法有哪些? 答: 顺序存取 随机存取 ,按键存取。 4 什么是文件的物理结构?它有哪几种组织方式? 答:文件的物理结构又称为文件的存储结构,指文件在存储介质上的组织形式,这与存储介 质的性质有关。 其组织形式可分为: (1) 连续文件 (2) 串联文件及其显示链接 (3) 索引文件及其混合索引文件 5 常见的目录结构有哪些?目前广泛采用的是哪种目录结构?其特点是什么?如果要在 目录 A 下使用文件名 X 对目录 B 中的文件 Y 进行共享,如何实现?请用图表示。 答:常见的目录结构有 (1) 单级目录结构 (2) 二级目录结构 (3) 多级目录结构。 多级目录结构也就是树形多级目录结构,被广泛使用。 其特点是:
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