Inode number layer Provide machine-oriented names for files. ↑ File layer Organize blocks into files. machine-oriented names Block layer Identify disk blocks. ↓ In the rest of this section we work our way up
文件名和 inode 之间的对应关系将文件名和文件的内容及属性连接起来。 大多是操作系统在同一个目录下是不允许存在同名文件的 删除文件不需要清空该文件占据的所有的空间数据(只需将该文件的 inode 和对应的数据块无效化即可(文件对应 inode 和 Block 位图中的数字 1 设置为 0,并将该文件所对应的目录中的数据块...
它有一个文件系统缓冲区缓存(file system buffer cache),使用 NBUF(29)个磁盘块,每个磁盘块的大小是 512 字节,用来暂时存储磁盘上的数据块和 inode,从而加速文件系统访问。另外还有一个索引节点数组(inode array),它有 NINODE (200)个条目,每个条目对应一个文件的元数据,还可以同时挂载 NMOUNT (8)个文件系统。
__kernel_sa_family_t sin_family;/*Address family*/---填入AF_INET。__be16 sin_port;/*Port number*/---端口号。structin_addr sin_addr;/*Internet address*/---IPv4的地址。/*Pad to size of `struct sockaddr'.*/unsignedchar__pad[__SOCK_SIZE__ -sizeof(shortint) -sizeof(unsignedshorti...
files, but they do so in different ways. a symbolic link is a separate file that points to the pathname of a target file, while a hard link is another name for the same file within the file system, pointing directly to the inode. what are the security implications of using symbolic ...
The one that looks like the most fun to me is modifying uxfs to support an inode structure that uses direct, single indirect, double indirect, and triple indirect blocks (described in Maurice Bach's book and elsewhere).In summary, if your basic operating system book's coverage of Unix ...
See Figure 1 on page 2 for a view of this structure. This information unit describes these two interfaces and discusses the things you need to know to write a VFS server or a PFS, or to port one to the z/OS UNIX environment. In order to do this, you should be a system programmer...
The data structure part (called an inode in UNIX/linux systems) identities important pieces of information about the content, but does not include the content itself (or a name of the file for that matter). One of the pieces of information it keeps is a memory address to where the content...
Each option offers trade-offs that are best explored though a cost-benefit analysis, which is discussed later in this chapter. Application Structure The next step toward the goal of migrating an application from UNIX to Windows is to gain a high-level view of the application to determine the ...
In general,initcontrols the multiuser mode boot process.initruns whatever initialization scripts it has been designed to run, and the structure of theinitprogram determines the fundamental design of the set of initialization scripts for that Unix version: what the scripts are named, where they are...