private BobFsNode NewNode(string name, ENodeType type)
{
if (!IsDirectory)
{
throw new InvalidOperationException("Current node is not a directory.");
}
// Get free inum
// TODO: Can be optimized
// TODO: Implement caching
int freeInum = -1;
_bobFs.Source.ReadAll(BobFs.BlockSize * 2, _tmpBuffer, 0, BobFs.BlockSize);
BitArray inodeBitmap = new BitArray(_tmpBuffer);
for (int index = 0; index < BobFs.BlockSize * 8 && freeInum == -1; index++)
{
if (!inodeBitmap[index])
{
freeInum = index;
}
}
if (freeInum == -1)
{
throw new Exception("No free Inode.");
}
inodeBitmap[freeInum] = true;
inodeBitmap.CopyTo(_tmpBuffer, 0);
_bobFs.Source.WriteAll(BobFs.BlockSize * 2, _tmpBuffer, 0, BobFs.BlockSize);
// Add to directory
DirEntry newDirEntry = new DirEntry();
newDirEntry.Inum = (uint)freeInum;
newDirEntry.Name = name;
int bytesWritten = newDirEntry.WriteTo(this, (int)Size);
if (bytesWritten < 0)
{
throw new Exception("Current directory is full.");
}
// Create inode at inum
BobFsNode newInode = new BobFsNode(_bobFs, (uint)freeInum);
newInode.Type = type;
newInode.NumLinks = 1;
newInode.Size = 0;
newInode.Commit();
return(newInode);
}
public void LinkNode(string name, BobFsNode file)
{
if (!IsDirectory)
{
throw new InvalidOperationException("Current node is not a directory.");
}
// Add to directory
DirEntry newDirEntry = new DirEntry();
newDirEntry.Inum = file.Inum;
newDirEntry.Name = name;
int bytesWritten = newDirEntry.WriteTo(this, (int)Size);
if (bytesWritten < 0)
{
throw new Exception("Current directory is full.");
}
// Update nlinks in node
file.Node.NumLinks++;
file.Commit();
}