docs: clarify snapshot dedup behavior across scan modes - #349
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The Snapshots section in gotchas.md described snapshot dedup behavior that only applied to older subvol scan modes. Since v0.11, extent scan mode (the default) uses LOGICAL_INO to find all references to an extent including snapshot copies, deduping them together in one pass. Update the documentation to distinguish between scan modes, add a note about upcoming v0.12 improvements, and add a case study for extent scan mode behavior. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
LOGICAL_INOto discover and dedupe all snapshot references in a single pass, avoiding the per-snapshot scanning cost of older subvol scan modesPrompted by this comment suggesting a docs update to clarify the snapshot limitation.
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