Inodes and File Structure.A link count telling how many hard links point to the inode . The inodes have their own space in each group. 这些对象是超级块(superblock)、inode 、dentry和文件。 These objects are the superblock, inode , dentry, and file. Inode_uid记录inode 所有者的用户ID。 Inode_uid Records the user ID of the inode 's owner.
Free space and inodes are handled by B+ trees inside the allocation groups. Inode_gid Records the group ID of the inode 's owner. 另外,这一支持使磁盘inode 与固定磁盘位置分离。 Additionally, this feature decouples disk inodes from fixed disk locations. The number of iNodes indicate the number of files and folders you have. 之前介绍过的inode 是EXT文件系统中的元数据的关键组件。 The inode , described previously, is a key component of the metadata in EXT filesystems. The different timestamps are stored in the metadata contained in the inodes .A portion of the inode structure is shown in Figure 5 along with a couple of the related structures. 例如一个重要的区别:SELinux通过inode 编号而不是路径标识文件系统对象。 One important difference, SELinux identifies file system objects by inode number instead of path. 但是,它仍然不支持独立存取,inode 修改和时间戳修改。 However, there still was no support for the separate access, inode modification and data modification timestamps. 通过比较文件名和inode 的数目,系统能够构造出一个便于用户理解的树结构。 By comparing file names and inode numbers, the system can make up a tree-structure that the user understands. 与传统的文件结构类似,F2FS有三种类型的节点:inode ,直接节点,间接节点。 Similar to traditional file structures, F2FS has three types of nodes: inode , direct node, indirect node. 每个inode 都包含有关一个文件的信息,包括属于该文件的数据块的位置。 Each inode contains information about one file, including the locations of the data blocks belonging to the file. 在Unix操作系统中,inode 是指UNIX文件系统中的单个文件的电脑储存档案。 In a UNIX-based operating system, an inode is a computer-stored description of an individual file in a UNIX file system. 可以用read_inode 和write_inode读写inode,用sync_fs执行文件系统同步。 You can read and write inodes with read_inode and write_inode or sync the file system with sync_fs. Ext4将未使用的块组标记到inode 表中,并让fsck进程忽略它们以加快检查速度。 Ext4 marks unused groups of blocks within the inode table to allow the fsck process to skip them entirely to speed the check process. 图2显示了inode 和存储在硬盘驱动器上的数据之间的关系。 Figure 2 shows the relationship between the inode and the data stored on the hard drive. 因为inode 没有重新分配,所以我们可以尝试查看文件的备份是否仍然驻留在日志中。 Because the inode wasn't reallocated we can try to see if a backup of the file still resides in the journaling. 例如,单个ext4inode 有足够的空间来引用4个区段(每个区段表示一组相邻的块)。 For example, a single ext4 inode has sufficient space to reference four extents(where each extent represents a set of contiguous blocks). 图2:inode 存储有关每个文件的信息,并使EXT文件系统能够查找属于它的所有数据。 Figure 2: The inode stores information about each file and enables the EXT filesystem to locate all data belonging to it. 注意,对于inode 缓存中的每个inode ,在目录缓存中都有一个对应的dentry。 Note that for each inode in the inode cache there is a corresponding dentry in the directory cache. Inode 包含管理文件系统中的对象所需的所有元数据(包括可以在对象上执行的操作)。The inode contains all the metadata to manage objects in the file system(including the operations that are possible on it). 为没有inode 关联互内存区域,通常为:BSS(uninitializeddata). Indicates that no inode is associated with the memory region, as the case would be with BSS(uninitialized data). 每个inode 都表示着一种在硬盘上的数据结构,保存着文件的属性,包括文件数据的物理地址。 Each inode describes a data structure on the hard disk, storing the properties of a file, including the physical location of the file data. 个时间戳,记录了inode 自身被修改(ctime,inode changetime)、文件内容被修改(mtime,modificationtime)、最后一次访问(atime,accesstime)的时间。 Timestamps telling when the inode itself was last modified(ctime, inode change time), the file content last modified(mtime, modification time), and last accessed(atime, access time).
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