public VfsXfsFileSystem(Stream stream, FileSystemParameters parameters)
: base(new XfsFileSystemOptions(parameters))
{
stream.Position = 0;
byte[] superblockData = Utilities.ReadFully(stream, 264);
SuperBlock superblock = new SuperBlock();
superblock.ReadFrom(superblockData, 0);
if (superblock.Magic != SuperBlock.XfsMagic)
{
throw new IOException("Invalid superblock magic - probably not an xfs file system");
}
Context = new Context
{
RawStream = stream,
SuperBlock = superblock,
Options = (XfsFileSystemOptions)Options
};
var allocationGroups = new AllocationGroup[superblock.AgCount];
long offset = 0;
for (int i = 0; i < allocationGroups.Length; i++)
{
var ag = new AllocationGroup(Context, offset);
allocationGroups[ag.InodeBtreeInfo.SequenceNumber] = ag;
offset += ag.FreeBlockInfo.Length * superblock.Blocksize;
}
Context.AllocationGroups = allocationGroups;
RootDirectory = new Directory(Context, Context.GetInode(superblock.RootInode));
}
public Inode GetInode(ulong number)
{
var inode = new Inode(number, this);
AllocationGroup group = AllocationGroups[inode.AllocationGroup];
group.LoadInode(inode);
if (inode.Magic != Inode.InodeMagic)
{
throw new IOException("invalid inode magic");
}
return(inode);
}
public override void LoadBtree(AllocationGroup ag)
{
Children = new Dictionary <uint, BtreeHeader>(NumberOfRecords);
for (int i = 0; i < NumberOfRecords; i++)
{
BtreeHeader child;
if (Level == 1)
{
child = new BTreeInodeLeave();
}
else
{
child = new BTreeInodeNode();
}
var data = ag.Context.RawStream;
data.Position = (Pointer[i] * ag.Context.SuperBlock.Blocksize) + ag.Offset;
var buffer = Utilities.ReadFully(data, (int)ag.Context.SuperBlock.Blocksize);
child.ReadFrom(buffer, 0);
child.LoadBtree(ag);
Children.Add(Keys[i], child);
}
}
public abstract void LoadBtree(AllocationGroup ag);
public override void LoadBtree(AllocationGroup ag)
{
}