protected OffsetTableHardDisk(HardDisk hdd)
{
if (hdd == null)
{
throw new ArgumentNullException(nameof(hdd));
}
mHdd = hdd;
mReadBlock = readBlock;
mGetBlockKey = getBlockKey;
}
public LeafVdevInfo(HardDisk hdd)
{
this.HDD = hdd;
var rentedBytes = Program.RentBytes(VDEV_PHYS_SIZE);
try
{
if (!hdd.ReadLabelBytes(rentedBytes, VDEV_SKIP_SIZE))
{
throw new Exception("Invalid checksum on lable config data!");
}
Config = new NvList(rentedBytes);
}
finally
{
Program.ReturnBytes(rentedBytes);
rentedBytes = default(ArraySegment <byte>);
}
//figure out how big the uber blocks are
var vdevTree = Config.Get <NvList>("vdev_tree");
var ubShift = (int)vdevTree.Get <ulong>("ashift");
ubShift = Math.Max(ubShift, UBERBLOCK_SHIFT);
ubShift = Math.Min(ubShift, MAX_UBERBLOCK_SHIFT);
var ubSize = 1 << ubShift;
var ubCount = VDEV_UBERBLOCK_RING >> ubShift;
List <uberblock_t> blocks = new List <uberblock_t>();
var ubBytes = Program.RentBytes(ubSize);
try
{
for (long i = 0; i < ubCount; i++)
{
var offset = VDEV_SKIP_SIZE + VDEV_PHYS_SIZE + ubSize * i;
if (!hdd.ReadLabelBytes(ubBytes, offset))
{
continue;
}
uberblock_t b = Program.ToStruct <uberblock_t>(ubBytes.Array, ubBytes.Offset);
if (b.Magic == uberblock_t.UbMagic)
{
blocks.Add(b);
}
}
}
finally
{
Program.ReturnBytes(ubBytes);
ubBytes = default(ArraySegment <byte>);
}
this.Uberblock = blocks.OrderByDescending(u => u.Txg).ThenByDescending(u => u.TimeStamp).First();
const int VDevLableSizeStart = 4 << 20;
const int VDevLableSizeEnd = 512 << 10;
hdd = OffsetHardDisk.Create(hdd, VDevLableSizeStart, hdd.Length - VDevLableSizeStart - VDevLableSizeEnd);
this.HDD = hdd;
}
