A file system checker in a UNIX-like system has built up a bit map for disk bloc
ID: 3827700 • Letter: A
Question
A file system checker in a UNIX-like system has built up a bit map for disk blocks that are in use by checking the inode information associated with all files (1 indicates "in use" and 0 indicates "not in use"). On the other hand, the current bit map for free blocks maintained by the operating system contains the information shown below (1 indicates "free" and 0 indicates "not free"):
Bit maps
Block #
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
In-use
1
0
1
0
0
1
0
1
1
0
1
0
0
1
0
Free
0
0
0
1
1
1
0
0
0
1
0
1
1
0
1
Are there any inconsistencies in what you see? If so, indicate their nature. Are these serious errors that need to be addressed immediately? Explain in brief.
Thanks a lot for your help!4
Bit maps
Block #
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
In-use
1
0
1
0
0
1
0
1
1
0
1
0
0
1
0
Free
0
0
0
1
1
1
0
0
0
1
0
1
1
0
1
Explanation / Answer
Ans:: There are some inconsistencies at '1' and '6' in the above mentioned question.
-->> These are serious fatal errors which are to be addressed.
Explanation:
-->> The 'data_bitmap' shows the block is 'free'., while inode says it is used.so it 'must' be 'fixed'.
// Thank_you //
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