public MetaSlabs(ObjectSet mos, long metaSlabArray, int metaSlabShift, int aShift)
{
mMos = mos;
mSlabSize = 1L << metaSlabShift;
var slabDnode = mos.ReadEntry(metaSlabArray);
var someBytes = Program.RentBytes(checked((int)slabDnode.AvailableDataSize));
slabDnode.Read(someBytes, 0);
int numberOfSlabs = someBytes.Count / 8;
mRangeMap = new RangeMap[numberOfSlabs];
long[] ids = new long[numberOfSlabs];
Buffer.BlockCopy(someBytes.Array, someBytes.Offset, ids, 0, someBytes.Count);
Program.ReturnBytes(someBytes);
someBytes = default(ArraySegment<byte>);
for (int i = 0; i < numberOfSlabs; i++)
{
var id = ids[i];
RangeMap map;
if (id == 0)
{
map = new RangeMap();
}
else
{
map = LoadEntrysForMetaSlab(id, aShift);
}
mRangeMap[i] = map;
}
}
internal DatasetDirectory(ObjectSet mos, long objectid, string name, Zio zio)
{
this.mMos = mos;
this.mZio = zio;
this.Name = name;
this.Type = DataSetType.MetaData;
var rootDslObj = mos.ReadEntry(objectid);
if (rootDslObj.Type != dmu_object_type_t.DSL_DIR)
throw new NotSupportedException("Expected DSL_DIR dnode.");
if (rootDslObj.BonusType != dmu_object_type_t.DSL_DIR)
throw new NotSupportedException("Expected DSL_DIR bonus.");
mDslDir = rootDslObj.GetBonus<dsl_dir_phys_t>();
var rootDslProps = Zap.Parse(mos, mDslDir.props_zapobj);
Dictionary<string, long> clones;
if (mDslDir.clones != 0)
{
clones = Zap.GetDirectoryEntries(mos, mDslDir.clones);
}
if (mDslDir.head_dataset_obj == 0)
return; //probably meta data, like $MOS or $FREE
var rootDataSetObj = mos.ReadEntry(mDslDir.head_dataset_obj);
if (!IsDataSet(rootDataSetObj))
throw new Exception("Not a dataset!");
if (rootDataSetObj.BonusType != dmu_object_type_t.DSL_DATASET)
throw new Exception("Missing dataset bonus!");
var headDs = rootDataSetObj.GetBonus<dsl_dataset_phys_t>();
if (headDs.bp.IsHole && mDslDir.origin_obj == 0)
return; //this is $ORIGIN
if (headDs.snapnames_zapobj != 0)
{
mSnapShots = Zap.GetDirectoryEntries(mMos, headDs.snapnames_zapobj);
}
if (headDs.bp.Type != dmu_object_type_t.OBJSET)
throw new Exception("Expected OBJSET.");
var headDsObjset = zio.Get<objset_phys_t>(headDs.bp);
switch (headDsObjset.Type)
{
case dmu_objset_type_t.DMU_OST_ZFS:
this.Type = DataSetType.ZFS;
break;
case dmu_objset_type_t.DMU_OST_ZVOL:
this.Type = DataSetType.ZVOL;
break;
default:
throw new Exception("Unknow dataset type: " + headDsObjset.Type.ToString());
}
}