/// <summary>
/// Generates a "free list" of unused blocks in the existing parity data
/// for this drive which we can then re-use for adds, so that we don't grow
/// the parity data unnecessarily.
/// </summary>
public List <FreeNode> GetFreeList()
{
BitArray blockMask = BlockMask;
List <FreeNode> freeList = new List <FreeNode>();
UInt32 block = 0;
while (block < MaxBlock)
{
if (!blockMask.Get((int)block))
{
FreeNode n = new FreeNode();
n.Start = block++;
n.Length = 1;
while (block < MaxBlock && (!blockMask.Get((int)block)))
{
n.Length++;
block++;
}
freeList.Add(n);
}
else
{
block++;
}
}
return(freeList);
}
public static UInt32 FindBest(List <FreeNode> list, UInt32 blocks)
{
FreeNode best = null;
foreach (FreeNode n in list)
{
if (n.Length == blocks)
{
best = n;
break;
}
else if (n.Length > blocks)
{
if ((best == null) || (n.Length < best.Length))
{
best = n;
}
}
}
if (best == null)
{
return(INVALID_BLOCK);
}
UInt32 result = best.Start;
if (best.Length == blocks)
{
list.Remove(best);
}
else
{
best.Start += blocks;
best.Length -= blocks;
}
return(result);
}
/// <summary>
/// Generates a "free list" of unused blocks in the existing parity data
/// for this drive which we can then re-use for adds, so that we don't grow
/// the parity data unnecessarily.
/// </summary>
public List<FreeNode> GetFreeList()
{
BitArray blockMask = BlockMask;
List<FreeNode> freeList = new List<FreeNode>();
UInt32 block = 0;
while (block < MaxBlock)
if (!blockMask.Get((int)block)) {
FreeNode n = new FreeNode();
n.Start = block++;
n.Length = 1;
while (block < MaxBlock && (!blockMask.Get((int)block))) {
n.Length++;
block++;
}
freeList.Add(n);
}
else
block++;
return freeList;
}