What does the superblock in Linux define?

What does the superblock in Linux define?

• A. Location of the first inode
• B. Disk geometry
• C. Available space
• D. File names

Answer: (A)

The superblock carries essential filesystem-wide metadata, including the index of the first non-reserved inode. This is the value used by the inode allocator to start assigning inode numbers, because several inodes are reserved for special purposes (for example, in many ext-based systems, inode 0 and 1 are reserved, and inode 2 is the root directory). The field in the superblock that holds this starting point is the indicator for the first usable inode number, which is what “location of the first inode” is referring to in this context. Disk geometry is not defined by the filesystem’s superblock; it’s determined by the hardware/partitioning layer. File names aren’t defined by the superblock either—they’re stored in directory entries and inodes. While the superblock does track counts like free blocks and free inodes, the most direct, specific item it defines among these options is the first non-reserved inode number used to begin allocation.

The superblock carries essential filesystem-wide metadata, including the index of the first non-reserved inode. This is the value used by the inode allocator to start assigning inode numbers, because several inodes are reserved for special purposes (for example, in many ext-based systems, inode 0 and 1 are reserved, and inode 2 is the root directory). The field in the superblock that holds this starting point is the indicator for the first usable inode number, which is what “location of the first inode” is referring to in this context.

Disk geometry is not defined by the filesystem’s superblock; it’s determined by the hardware/partitioning layer. File names aren’t defined by the superblock either—they’re stored in directory entries and inodes. While the superblock does track counts like free blocks and free inodes, the most direct, specific item it defines among these options is the first non-reserved inode number used to begin allocation.