/** Add a snapshot. */
Snapshot addSnapshot(int id, String name) throws SnapshotException, QuotaExceededException {
// check snapshot quota
final int n = getNumSnapshots();
if (n + 1 > snapshotQuota) {
throw new SnapshotException(
"Failed to add snapshot: there are already "
+ n
+ " snapshot(s) and the snapshot quota is "
+ snapshotQuota);
}
final Snapshot s = new Snapshot(id, name, this);
final byte[] nameBytes = s.getRoot().getLocalNameBytes();
final int i = searchSnapshot(nameBytes);
if (i >= 0) {
throw new SnapshotException(
"Failed to add snapshot: there is already a "
+ "snapshot with the same name \""
+ Snapshot.getSnapshotName(s)
+ "\".");
}
final DirectoryDiff d = getDiffs().addDiff(s, this);
d.snapshotINode = s.getRoot();
snapshotsByNames.add(-i - 1, s);
// set modification time
updateModificationTime(Time.now(), null, null);
s.getRoot().setModificationTime(getModificationTime(), null, null);
return s;
}
