Attribute - $INDEX_ROOT (0x90)

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This is the root node of the B+ tree that implements an index (e.g. a directory). This file attribute is always resident.

Layout of the Attribute

Offset Size Description
~ ~ Standard Attribute Header
0 4 Attribute Type
4 4 Collation Rule
8 4 Bytes per Index Record
12 1 Clusters per Index Record
16 16 Index Node Header
32 X Index Entry
32+X Y Next Index Entry
~ ~ ...


If Bytes per Index Record are less than cluster size, then Clusters per Index Record and all file's Index Records' VCNs are specified in sectors.

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