Linux Ext Series File system
- Superblock (super fast), Superblock is a place to record information about the entire file system, and Superblock, there is no such file system. The main information it records are:
- Block vs. Inode Total
- Number of unused and used Inode/block
- Size of block and inode
- File system mount time, the last time the data was written, the last time the disk was checked (fsck), and other information about the file system
- A Validbit value that indicates whether the file system has been mounted
- File System Description, which describes the block numbers for each block group's start and end, and describes each segment (Superblock,bitmap,inodemap,data Block) between each block number
- Block bitmap, which is used to record which block is empty.
- Inode Bitmap, similar to block bitmap, used to record which inode is unused
DF command to view the devices currently mounted
The DUMPE2FS command allows you to view information for each section and Superblock.
Linux Learning note 9-file, directory, and disk Format II
