void RemoveOldRevisions(List <VolumeSnapshotRevision> revisionsThatCanBeRemoved)
{
foreach (VolumeSnapshotRevision revision in revisionsThatCanBeRemoved)
{
mDatabase.DeleteSnapshotRevision(revision);
mArchive.DeleteRevision(revision);
}
}
void MergeSnapshotRevisions(VolumeSnapshotDatabase database, VolumeSource source, BaseArchive archive, int numRevisionsToRemove)
{
try
{
mDatabase = database;
mArchive = archive;
mBusy = true;
List <VolumeSnapshotRevision> revisionHistory = database.GetRevisionHistory();
if (numRevisionsToRemove == revisionHistory.Count)
{
// Need to remove all old revisions, delete everything
FileSync.__Log(this, "Merge deleting all revisions");
database.DeleteAllRevisions();
}
else
{
// now we know how many revisions to remove, need to rebuild the new first revision.
VolumeSnapshotRevision currentRevision = revisionHistory[numRevisionsToRemove];
VolumeSnapshot currentSnapshot = database.LoadSnapshotRevision(source, currentRevision);
FileSync.__Log(this, "Merge is turning revision [" + currentRevision.ToString() + "] into baseline");
TurnSnapshotIntoBaseline(currentSnapshot);
// Now go through all existing snapshot .xml files and change any files referencing
// a snapshot that has been removed and change it to the current snapshot revision.
for (int revisionNum = numRevisionsToRemove + 1; revisionNum < revisionHistory.Count; ++revisionNum)
{
VolumeSnapshotRevision incrementalRevision = revisionHistory[revisionNum];
VolumeSnapshot incrementalSnapshot = database.LoadSnapshotRevision(source, incrementalRevision);
FileSync.__Log(this, "Merge is reflecting revision [" + incrementalRevision.ToString() + "] into new baseline [" + currentRevision.ToString() + "]");
UpdateSnapshotToReflectBaselineRevision(incrementalSnapshot, currentRevision);
}
// delete old revision data
for (int revisionNum = 0; revisionNum < numRevisionsToRemove; ++revisionNum)
{
VolumeSnapshotRevision revisionToDelete = revisionHistory[revisionNum];
FileSync.__Log(this, "Merge is deleting revision [" + revisionToDelete.ToString() + "]");
database.DeleteSnapshotRevision(revisionToDelete);
}
}
}
catch (System.Exception ex)
{
FileSync.__LogError(this, "Volume.CheckForExpiredSnapshotRevisions", ex);
}
finally
{
mBusy = false;
}
}
public bool DoBackup(ref bool outputToXmlRequired)
{
VolumeSnapshot currentSnapshot = null;
bool backupSuccess = false;
bool noChangesRequired = false;
outputToXmlRequired = false;
mCancelledByUser = false;
try
{
mBusy = true;
FileSync.__Log(this, "Building standing on disk snapshot...");
// Take a snapshot of the volume as it stands on disk
currentSnapshot = VolumeSnapshot.BuildFromSource(mSource);
if (!currentSnapshot.Empty)
{
FileSync.__Log(this, "Snapshot built, " + currentSnapshot.FileCount + " files found");
VolumeSnapshotRevision mostRecentRevision = mDatabase.GetMostRecentRevision();
// Compare to previous snapshot
if (mostRecentRevision != null)
{
FileSync.__Log(this, "Starting incremental backup, " + mDatabase.GetRevisionHistory().Count
+ " revisions existing [Most recent: " + mostRecentRevision.ToString() + "]");
// Only do an incremental backup to backup whats changed since last full snapshot
VolumeSnapshot mostRecentSnapshot = mDatabase.LoadSnapshotRevision(mSource, mostRecentRevision);
backupSuccess = mBackupOperation.DoIncrementalBackup(currentSnapshot, mostRecentSnapshot, mSource, mArchive, out noChangesRequired);
FileSync.__Log(this, "Incremental backup " + (backupSuccess ? "completed successfully" : "failed")
+ " " + (noChangesRequired ? "no changes required" : "changes detected"));
}
else
{
FileSync.__Log(this, "Starting full initial backup");
// Brand new volume backup, do a full backup of the volume
backupSuccess = mBackupOperation.DoFullBackup(currentSnapshot, mSource, mArchive);
FileSync.__Log(this, "Full backup " + (backupSuccess ? "completed successfully" : "failed"));
}
if (backupSuccess)
{
if (!noChangesRequired)
{
FileSync.__Log(this, "Saving snapshot revision file [" + currentSnapshot.Revision.ToString() + "]");
mDatabase.SaveSnapshotRevision(currentSnapshot);
outputToXmlRequired = true;
FileSync.__Log(this, "Snapshot file saved");
}
else
{
FileSync.__Log(this, "No changes required, not saving revision [" + currentSnapshot.Revision.ToString() + "]");
}
}
else
{
FileSync.__Log(this, "Backup failed, deleting temporary files for revision [" + currentSnapshot.Revision.ToString() + "]");
mDatabase.DeleteSnapshotRevision(currentSnapshot.Revision); // remove half-copied data
mArchive.DeleteRevision(currentSnapshot.Revision);
outputToXmlRequired = true;
}
}
else
{
FileSync.__Log(this, "Built snapshot is empty, aborting backup");
}
}
catch (Exception e)
{
backupSuccess = false;
FileSync.__LogError(this, "BackupRestoreVolume.DoBackup", e);
if (currentSnapshot != null)
{
FileSync.__Log(this, "Backup failed due to exception caught, deleting temporary files for revision [" + currentSnapshot.Revision.ToString() + "]");
mDatabase.DeleteSnapshotRevision(currentSnapshot.Revision); // remove half-copied data
mArchive.DeleteRevision(currentSnapshot.Revision);
}
outputToXmlRequired = true;
}
finally
{
mBusy = false;
}
return(backupSuccess);
}
void MergeSnapshotRevisions( VolumeSnapshotDatabase database, VolumeSource source, BaseArchive archive, int numRevisionsToRemove )
{
try
{
mDatabase = database;
mArchive = archive;
mBusy = true;
List<VolumeSnapshotRevision> revisionHistory = database.GetRevisionHistory();
if ( numRevisionsToRemove == revisionHistory.Count )
{
// Need to remove all old revisions, delete everything
FileSync.__Log( this, "Merge deleting all revisions" );
database.DeleteAllRevisions();
}
else
{
// now we know how many revisions to remove, need to rebuild the new first revision.
VolumeSnapshotRevision currentRevision = revisionHistory[ numRevisionsToRemove ];
VolumeSnapshot currentSnapshot = database.LoadSnapshotRevision( source, currentRevision );
FileSync.__Log( this, "Merge is turning revision [" + currentRevision.ToString() + "] into baseline" );
TurnSnapshotIntoBaseline( currentSnapshot );
// Now go through all existing snapshot .xml files and change any files referencing
// a snapshot that has been removed and change it to the current snapshot revision.
for ( int revisionNum = numRevisionsToRemove + 1; revisionNum < revisionHistory.Count; ++revisionNum )
{
VolumeSnapshotRevision incrementalRevision = revisionHistory[ revisionNum ];
VolumeSnapshot incrementalSnapshot = database.LoadSnapshotRevision( source, incrementalRevision );
FileSync.__Log( this, "Merge is reflecting revision [" + incrementalRevision.ToString() + "] into new baseline [" + currentRevision.ToString() + "]" );
UpdateSnapshotToReflectBaselineRevision( incrementalSnapshot, currentRevision );
}
// delete old revision data
for ( int revisionNum = 0; revisionNum < numRevisionsToRemove; ++revisionNum )
{
VolumeSnapshotRevision revisionToDelete = revisionHistory[ revisionNum ];
FileSync.__Log( this, "Merge is deleting revision [" + revisionToDelete.ToString() + "]" );
database.DeleteSnapshotRevision( revisionToDelete );
}
}
}
catch ( System.Exception ex )
{
FileSync.__LogError( this, "Volume.CheckForExpiredSnapshotRevisions", ex );
}
finally
{
mBusy = false;
}
}