Ext2, ext3, and ext4 file systems: Linux general technology-Linux technology and application information. For more information, see the following. The younger brother doesn't understand the ext2 file system just now, but he doesn't know much about the specific structure of ext3 and ext4. It's too general on the internet !!!
Ext2 File System:
Inode: a single size of 128 bytes, including 12 Direct indexes of 48 bytes (the block number of the record data), 128-48 = 80 bytes inode table (the attribute of the record file ).
Block: a single size is supported. Only 1 K, 2 K, 4 K, and 3 types are supported. (Record Data)
Spuer block: Generally, the size is 1024 bytes. It records the overall information of the file system, including the total number of inode/blocks, usage, and remaining amount, as well as the format and related information of the file system.
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Inode bitmap: inode table, which records the use of unused inode numbers.
Block bitmap: block table, which records the use of unused block numbers.
The above content is my understanding of the ext2 file system. If there is something wrong, please point it out !!!
Which of the following friends can help explain the structure and principle of ext3 and ext4 to the younger brother? It is best to follow the template above. Thank you !!!
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