private BufferEntry GetBufferForKey(LowLevelTransaction lltx, long key, byte depth)
{
var buffer = lltx.Buffers.GetEntry(Root.FileId, Root.PageNumber);
using (var tx = lltx.StartNew())
{
while (true)
{
if (IsLeaf(buffer))
{
break;
}
var page = lltx.CheckLatch(buffer, LatchFlags.Read) ? buffer.Page.AsFixed() : tx.EnterRead(buffer).AsFixed();
if (page.Depth == depth)
{
break;
}
buffer = tx.Buffers.GetEntry(page.FindPage(key));
}
}
return(buffer);
}