CODEWITHSUNDEEP
linuxfilesystemskernelinodeext4
Kode1000
Kode1000

Reputation: 55

ext4 block group layout clarification

I'm on an Ubuntu 22.04 x86_64 system, kernel version 6.5.0-15-generic. I've read the ext4 documentation on kernel.org and there are some parts that are not explained very thoroughly so I hope someone could kindly clarify these for me.

The layout of a single ext4 block group is shown as follow :

enter image description here

What I'd like to know is :

  1. What is exactly the "Reserved GDT Blocks" in few words ?

  2. I know that both files and directories are represented by inodes metadata structures in the inode Table. So each file and directory ( which is also a kind of file ) has its inode number. Now, if the directory metadata is contained in its inode structure in the inode Table, where is the directory data content ? Is it inside the Data Blocks ?

  3. The documentation makes a distinction between Linear ( classic ) Directories and Hash Tree Directories. Can we simply say that in both forms the directory data content just boils down essentially to a list of inode,user readable name pairs like this :

inode number -> name of the file

inode number -> name of the file

inode number -> name of the file

.........................................................

?

  1. Do the inodes structure inside the inode Table contain information about where the file or directory is located on disk ? If so, what field inside the struct ext4_inode is responsible for that ?

Upvotes: 0

Views: 67

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