Indirection scheme in i-node

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hi folks
 I have a simple doubt..Why is there an indirection scheme applied in
i-node instead of another structure.. I know tht triple level of
indirection works great for very large files... but are there any
performance reasons that indirection scheme is applied..

The reason I m asking this is that I need to modify the inode such that at
the last indirection level, instead of data block pointers, I need to
have address of a block containing X data block pointers instead of
(blocksize/4) data block pointers..

Does this have any drastic effect on the file system performance??

bye
a Linux lover

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