How does the inode map to data block of a file?

Answer Posted / shilpa

Inode has 13 block addresses. The first 10 are direct block
addresses of the first 10 data blocks in the file. The 11th
address points to a one-level index block. The 12th address
points to a two-level (double in-direction) index block.
The 13th address points to three-level (triple in-
direction).

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