Discussion
Which of the following is not a valid kernel data structure in Linux ?
Answer: D
The structure that is not a Linux kernel data structure is the Sector table.
For open files the kernel keeps three levels of tables: a per-process file descriptor table, a system-wide open file table holding the file offset and access mode, and an in-memory inode table holding the inodes of the open files.
Sectors are handled by the block device layer and the disk driver, which address blocks directly; there is no kernel 'sector table' alongside the other three, so it is the odd one out.
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