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...
EachUNIXfilehasadescriptionthatisstoredinastructurecalledinode.Aninodeincludes:•••••• filesizelocationowner(uid)permissionsaccesstimesetc.Directories AUNIXdirectoryisafilecontainingacorrespondencebetweeninodesandfilenames.Whenreferencingafile,theOperatingSystem(OS)traversestheFileSystemtreeto...
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...
UNIX treats all files as steams of data with no boundaries or structure. In UNIX, each file in the file system is described by an inode. This differs from a file name, as it refers to the following information about the file: Permissions Owner Type Date and time of creation and of las...
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 ...
UNIX treats all files as steams of data with no boundaries or structure. In UNIX, each file in the file system is described by an inode. This differs from a file name, as it refers to the following information about the file: Permissions Owner Type Date and time of creation and of las...
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 ...
真正找到磁盘上文件的并不是文件名,而是 inode。其实在 linux 中可以让多个文件名对应于同一个 inode 在删除文件时干了两件事情:1. 在目录中将对应的记录删除,2. 将硬连接数 - 1,如果为 0,则将对应的磁盘释放。 软链接: 注:硬链接是通过 inode 引用另外一个文件,软链接是通过名字引用另外一个文件 总结:...