= Indirect block pointer
An address in a traditional <inode>-based <file system> that points to a block of further <disk block numbers>, rather than directly to user contents. If a block can store $q$ addresses, one singly indirect block can locate up to $q$ <file data blocks>, and a doubly indirect arrangement can locate up to $q^2$. The address blocks themselves consume allocated storage and must be reclaimed when their <file> no longer needs them. This lets small <files> use a short direct layout while supporting larger <files>.
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