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Finding the next version of a particular file is a fast operation due to the structure of the LIN (logical inode) table. While the LIN table is frequently called a table, it is actually a B-Tree. It is sorted by (LIN,Version), so finding the next newer version of a LIN is an inexpensive operation.
A LIN is fundamentally the identity of an object and possess the following attributes:
Given a LIN:SnapID pairing, finding the next higher SnapID is a fast and efficient process, and the HEAD version is always represented by the biggest SnapID.
In the example above, 1:abcd:1234/MAX is not in the LIN Tree. This suggests that the file was deleted sometime after snapshot 100 was taken.