Doubts on Traditional FS

metadata is inode and inodetable[ ].
Q1. How to postion an address in a file?
They are linked by direct/indirect pointers. If small writes or inserting some contents, where to put them?

Q2. There are fragements, how bad will it hurt the fs performance?
There are cleaner algorithm. How often do they need to be done? In which way? daemon or command?

Q3. Where is root directory inode located?
At block 2 or some default block or specified somewhere?

LFS thoughts

How many files can be supported?
How large a file size can be supported?

Ext2 file analysis
http://homepage.smc.edu/morgan_david/cs40/analyze-ext2.htm

FS summary
http://www.science.unitn.it/~fiorella/guidelinux/tlk/node99.html