Operating Systems - Inode Structure - File Metadata & Block Pointers
If a file system is extended to support variable-sized blocks instead of fixed-size blocks, how should the inode structure be adapted to efficiently locate file data blocks?
If a file system is extended to support variable-sized blocks instead of fixed-size blocks, how should the inode structure be adapted to efficiently locate file data blocks?
hard🎤 Interviewer Follow-up Q10 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand variable block size impact
Variable-sized blocks require storing both address and size to locate data precisely.Step 2: Evaluate inode pointer adaptation
Fixed pointers (B) assume uniform block size, so they are insufficient. Bitmaps (C) track allocation but not block sizes. Storing only start block (D) cannot handle variable sizes.Step 3: Confirm best approach
Storing (block address, block size) pairs (A) allows precise location and size info per block.Final Answer:
Option A -> Option AQuick Check:
Variable block sizes require explicit size info per block [OK]
Quick Trick: Variable blocks need size info stored with pointers [OK]
Common Mistakes:
MISTAKES- Assuming fixed pointers suffice or relying on file size alone
Trap Explanation:
PITFALL- Candidates often overlook the need to store block size with address for variable blocks.
Interviewer Note:
CONTEXT- Tests ability to adapt inode design for non-standard block allocation.
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