boolean changedBetweenSnapshots(INodeFile file, Snapshot from, Snapshot to) { int[] diffIndexPair = diffs.changedBetweenSnapshots(from, to); if (diffIndexPair == null) { return false; } int earlierDiffIndex = diffIndexPair[0]; int laterDiffIndex = diffIndexPair[1]; final List<FileDiff> diffList = diffs.asList(); final long earlierLength = diffList.get(earlierDiffIndex).getFileSize(); final long laterLength = laterDiffIndex == diffList.size() ? file.computeFileSize(true, false) : diffList.get(laterDiffIndex).getFileSize(); if (earlierLength != laterLength) { // file length has been changed return true; } INodeFileAttributes earlierAttr = null; // check the metadata for (int i = earlierDiffIndex; i < laterDiffIndex; i++) { FileDiff diff = diffList.get(i); if (diff.snapshotINode != null) { earlierAttr = diff.snapshotINode; break; } } if (earlierAttr == null) { // no meta-change at all, return false return false; } INodeFileAttributes laterAttr = diffs.getSnapshotINode( Math.max(Snapshot.getSnapshotId(from), Snapshot.getSnapshotId(to)), file); return !earlierAttr.metadataEquals(laterAttr); }