/// <summary>
/// Checks if we have all the required reference information (ref backup usn metadata)
/// and if the usn journal is available (existing and usable from reference journal & transaction ids)
/// </summary>
/// <returns>
/// A <see cref="System.Boolean"/>
/// </returns>
public bool CheckCapability()
{
if (Utilities.PlatForm.IsUnixClient())
{
return(false);
}
try{
if (prevJournalId == 0 || prevTransactionId == 0 /*|| brd.SystemDrive.DriveFormat.ToLower() != "ntfs"*/)
{
Logger.Append(Severity.DEBUG, "No reference USN journal found. Either this is the first backup, either SetMetadata() has not been called yet, or drive is not NTFS/ReFS");
return(false);
}
using (NtfsUsnJournal jtest = new NtfsUsnJournal(brd /*.Snapshot.MountPoint*/)){
Console.WriteLine("CheckCapability() : instanciated usn j");
if (!jtest.IsUsnJournalActive())
{
Logger.Append(Severity.INFO, "the drive " + brd.SystemDrive.OriginalMountPoint + " doesn't have an USN tracking journal."
+ " It can be manually created using the command 'fsutil usn createjournal m=400000 a=100 " + brd.SystemDrive.OriginalMountPoint + "'");
}
if (journalId != prevJournalId /*|| transactionId < prevTransactionId*/) // journal has been reset, can't rely on it
{
Logger.Append(Severity.WARNING, "Drive " + brd.SystemDrive.OriginalMountPoint + " USN Journal has been reset since last time we checked it. Can't be used :"
+ "transaction id " + transactionId + "/" + prevTransactionId + ", journal " + journalId + "/" + prevJournalId);
/*Console.WriteLine ("********************************");
* Console.WriteLine ("***MAKE IT RETURN FALSE!!! *");
* Console.WriteLine ("********************************");*/
return(false);
}
if (prevTransactionId < journalMinUsn) // some space has been freeed inside the journal, we cannot read back to wanted transaction
{
Logger.Append(Severity.WARNING, "Drive " + brd.SystemDrive.MountPoint + " Wanted start USN (" + prevTransactionId + ")is too old, has been recycled by the journal (min usable USN is " + journalMinUsn + "). Unable to use USN. If this occurs frequently, consider growing the USN journal max size.");
return(false);
}
}
return(true);
}
catch (Exception e) {
Logger.Append(Severity.WARNING, "Drive '" + brd.SystemDrive.MountPoint + " (snap " + brd.Snapshot.MountPoint + ")' : can't use UsnJournal incremental/differential provider : " + e.ToString()
+ ". Journal may not be accessed, not available for this kind of filesystem, or doesn't exist. You can create one using 'fsutil usn createjournal' command");
return(false);
}
}
