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);
}
/** Load FileDiff list for a file with snapshot feature */
private void loadFileDiffList(InputStream in, INodeFile file, int size) throws IOException {
final FileDiffList diffs = new FileDiffList();
final LoaderContext state = parent.getLoaderContext();
for (int i = 0; i < size; i++) {
SnapshotDiffSection.FileDiff pbf = SnapshotDiffSection.FileDiff.parseDelimitedFrom(in);
INodeFileAttributes copy = null;
if (pbf.hasSnapshotCopy()) {
INodeSection.INodeFile fileInPb = pbf.getSnapshotCopy();
PermissionStatus permission =
loadPermission(fileInPb.getPermission(), state.getStringTable());
AclFeature acl = null;
if (fileInPb.hasAcl()) {
acl =
new AclFeature(
FSImageFormatPBINode.Loader.loadAclEntries(
fileInPb.getAcl(), state.getStringTable()));
}
copy =
new INodeFileAttributes.SnapshotCopy(
pbf.getName().toByteArray(),
permission,
acl,
fileInPb.getModificationTime(),
fileInPb.getAccessTime(),
(short) fileInPb.getReplication(),
fileInPb.getPreferredBlockSize());
}
FileDiff diff = new FileDiff(pbf.getSnapshotId(), copy, null, pbf.getFileSize());
diffs.addFirst(diff);
}
file.addSnapshotFeature(diffs);
}
public Quota.Counts cleanFile(
final INodeFile file,
final int snapshotId,
int priorSnapshotId,
final BlocksMapUpdateInfo collectedBlocks,
final List<INode> removedINodes,
final boolean countDiffChange)
throws QuotaExceededException {
if (snapshotId == Snapshot.CURRENT_STATE_ID) {
// delete the current file while the file has snapshot feature
if (!isCurrentFileDeleted()) {
file.recordModification(priorSnapshotId);
deleteCurrentFile();
}
collectBlocksAndClear(file, collectedBlocks, removedINodes);
return Quota.Counts.newInstance();
} else { // delete the snapshot
priorSnapshotId = getDiffs().updatePrior(snapshotId, priorSnapshotId);
return diffs.deleteSnapshotDiff(
snapshotId, priorSnapshotId, file, collectedBlocks, removedINodes, countDiffChange);
}
}