[Solved] Why might a file system designer limit the number of indirect pointers in an inode rather than allowing unlimited indirect pointers for very large files? | Operating Systems

Operating Systems - Inode Structure - File Metadata & Block Pointers

Why might a file system designer limit the number of indirect pointers in an inode rather than allowing unlimited indirect pointers for very large files?

ABecause indirect pointers increase the inode size exponentially, making inodes too large to store efficiently.

BBecause indirect pointers consume more inode space, reducing the number of files the system can track.

CBecause increasing indirect pointers indefinitely would cause excessive disk seek times and degrade performance.

DBecause indirect pointers require complex encryption, increasing CPU overhead.

Step-by-Step Solution

Step 1: Understand performance impact of indirect pointers
Each level of indirection adds extra disk reads, increasing seek times and latency.
Step 2: Analyze inode size constraints
Indirect pointers are stored in data blocks, not inodes, so inode size is fixed and not directly affected.
Step 3: Clarify inode size growth
Inode size does not grow exponentially with indirect pointers; pointer blocks are separate.
Step 4: Dispel encryption misconception
Indirect pointers do not inherently require encryption or extra CPU overhead.
Final Answer:
Option C -> Option C
Quick Check:
Performance degradation due to multiple disk seeks is the main limitation [OK]

Quick Trick: More indirection -> more disk seeks -> slower access

Common Mistakes:

MISTAKES

Confusing inode size with pointer block size
Assuming inode size grows with indirect pointers
Believing indirect pointers require encryption overhead

Trap Explanation:

PITFALL

Option A confuses inode size with pointer blocks. Option B exaggerates inode size growth. Option D introduces unrelated encryption overhead.

Interviewer Note:

CONTEXT

Tests understanding of performance trade-offs and inode design limitations.

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Solution Trace

More Operating Systems Quizzes

Why might a file system designer limit the number of indirect pointers in an inode rather than allowing unlimited indirect pointers for very large files?

Step 1: Understand performance impact of indirect pointers

Step 2: Analyze inode size constraints

Step 3: Clarify inode size growth

Step 4: Dispel encryption misconception

Final Answer:

Quick Check:

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