Maximum file size given a particular inode structure?

unix file system inode
solvingPuzzles picture solvingPuzzles · Apr 30, 2010 · Viewed 33.6k times · Source

Suppose a UNIX file system has some constraints--say, 2 KB blocks and 8B disk addresses. What is the maximum file size if inodes contain 13 direct entries, and one single, double, and triple indirect entry each?

Answer

WhirlWind picture WhirlWind · Apr 30, 2010

This explains it for you:

http://www.cis.temple.edu/~ingargio/cis307/readings/stable.html

"The maximum size of a file will be 8KB*(10 + 2**10 + 2**20 + 2**30), that is more than 8TB."

Swap 8KB for your 2KB, and adjust the entries for the smaller block size.

2KB*(10 + 2**8 + 2**16 + 2**24)

It's not clear to me from your question if the 13 entries include the singles, doubles and triples, or if they are separate, but that should be easy to adjust -- just change the 10 in the expression to a 13.

I think I've adjusted all the math correctly... double check it =| Hope this isn't homework I did for you ;)

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