virtual file system (VFS)

一.VFS作为内核子系统,为用户空间程序提供了文件系统相关的接口.所有实际文件系统依赖VFS共存,依靠VFS系统工作. 1.VFS提供通用文件系统接口:用户空间程序可以利用标准的UNIX文件系统调用,如open()\read()\write(),对不同物理介质上的不同文件系统进行操作. 2.VFS提供文件系统抽象层:VFS提供了一个通用文件系统模型,该模型囊括了所有实际文件系统的常用功能和行为.VFS抽象层定义了所有实际文件系统支持的基本的.概念上的接口和数据结构,所以VFS能衔接各种实际文件系

目录 1. Linux文件系统简介 2. 通用文件模型 3. VFS相关数据结构 4. 处理VFS对象 5. 标准函数 1. Linux文件系统简介 Linux系统由数以万计的文件组成,其数据存储在硬盘或者其他块设备(例如ZIP驱动.软驱.光盘等).存储使用了层次式文件系统,文件系统使用目录结构组织存储的数据,并将其他元信息(例如所有者.访问权限等)与实际数据关联起来Linux支持许多不同的文件系统 1. Ext2 2. Ext3 3. ReiserFS 4. XFS 5. VFAT(兼容DOS

SRC=http://www.cs.rutgers.edu/~pxk/416/notes/13-fs-studies.html Paul Krzyzanowski April 24, 2014 Introduction We've studied various approaches to file system design. Now we'll look at some real file systems to explore the approaches that were taken i

A clustered file system is a file system which is shared by being simultaneously mounted on multiple servers. There are several approaches to clustering, most of which do not employ a clustered file system (only direct attached storage for each node)

/**************************************************************************** * Samsung_tiny4412(笔记)-->list_head,proc file system,GPIO,ioremap * * * 2015-3-11 阴 深圳 尚观 Var 曾剑锋 ***************************************************************************

A file system layout apportions an underlying physical volume into one or more virtual volumes (vvols) of a storage system. The underlying physical volume is an aggregate comprising one or more groups of disks, such as RAID groups, of the storage sys

A treewalk for splitting a file directory is disclosed for parallel execution of work items over a filesystem. The given work item is assigned to a worker. Thereafter, a request is sent to split the file directory to share a portion of the file direc

referer: http://osxbook.com/book/bonus/chapter11/procfs/ Processes as Files The process file system ("procfs" for brevity, or simply "/proc", because that's where it is usually mounted) has become a common entity on Unix-like systems.

GFS是google分布式存储的基石,其他存储系统,比如Google的bigtable.megastore.percolator均直接或者间接的构建在GFS上. 系统架构 GFS Master维护了系统的元数据,包括文件及chunk命名空间.文件到chunk的映射关系.chunk的位置信息:复制整个系统的全局控制,master定期会与CS通过心跳的方式交换信息 GFS ChunkServer(CS,数据块服务器)64MB的chunk块,由master在创建时分配一个64位全局唯一的chunk句柄