public ObjectSet(Zio zio, objset_phys_t os)
{
if (zio == null)
{
throw new ArgumentNullException("zio");
}
mZio = zio;
mType = os.Type;
mMetaDNode = new DNode(zio, os.MetaDnode);
}
public DNode(Zio zio, dnode_phys_t phys)
{
if (phys.NLevels == 0)
{
throw new ArgumentOutOfRangeException(nameof(phys), "Expect dnode's NLevels to be > 0");
}
mZio = zio;
mGetBlockKey = getBlockKey;
mReadBlock = readBlock;
mPhys = phys;
}
/// <summary>
/// Reads and verifies data from a label.
/// </summary>
/// <param name="offset"></param>
/// <param name="count"></param>
/// <returns>true if the checksum is valid, false otherwise</returns>
public bool ReadLabelBytes(ArraySegment <byte> dest, long offset)
{
ReadBytes(dest, offset);
var verifier = new zio_cksum_t()
{
word1 = (ulong)offset,
word2 = 0,
word3 = 0,
word4 = 0,
};
return(Zio.IsEmbeddedChecksumValid(dest, verifier));
}
internal Zpl(ObjectSet mos, long objectid, Zio zio)
{
this.mZio = zio;
var rootDataSetObj = mos.ReadEntry(objectid);
if (!DatasetDirectory.IsDataSet(rootDataSetObj))
{
throw new Exception("Not a DSL_DIR.");
}
mDataset = rootDataSetObj.GetBonus <dsl_dataset_phys_t>();
if (rootDataSetObj.IsNewType && rootDataSetObj.NewType == dmu_object_byteswap.DMU_BSWAP_ZAP)
{
var dataSetExtensions = Zap.Parse(rootDataSetObj);
}
if (mDataset.prev_snap_obj != 0)
{
var dn = mos.ReadEntry(mDataset.prev_snap_obj);
var moreDs = dn.GetBonus <dsl_dataset_phys_t>();
}
if (mDataset.props_obj != 0)
{
var someProps = Zap.Parse(mos, mDataset.props_obj);
}
mZfsObjset = new ObjectSet(mZio, zio.Get <objset_phys_t>(mDataset.bp));
if (mZfsObjset.Type != dmu_objset_type_t.DMU_OST_ZFS)
{
throw new NotSupportedException();
}
mZfsObjDir = Zap.GetDirectoryEntries(mZfsObjset, 1);
if (mZfsObjDir["VERSION"] != 5)
{
throw new NotSupportedException();
}
var saAttrs = Zap.GetDirectoryEntries(mZfsObjset, mZfsObjDir["SA_ATTRS"]);
var saLayouts = Zap.Parse(mZfsObjset.ReadEntry(saAttrs["LAYOUTS"]));
var saRegistry = Zap.GetDirectoryEntries(mZfsObjset, saAttrs["REGISTRY"]);
mAttrSize = new Dictionary <zpl_attr_t, int>();
foreach (var kvp in saRegistry)
{
var attrName = (zpl_attr_t)(kvp.Value & 0xffff);
var size = (int)(kvp.Value >> 24 & 0xffff);
if (kvp.Key != attrName.ToString())
{
throw new Exception();
}
mAttrSize.Add(attrName, size);
}
foreach (var layoutName in saLayouts.Keys)
{
var layoutNumber = int.Parse(layoutName);
var types = ((short[])saLayouts[layoutName]).Select(a => (zpl_attr_t)a).ToArray();
mAttrLayouts.Add(layoutNumber, new SaLayout(mAttrSize, types));
}
}
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());
}
}
private void Load()
{
if (mHdds.Count == 0)
{
throw new Exception("Did not find any hard drives.");
}
//make sure we support reading the pool
foreach (var hdd in mHdds)
{
CheckVersion(hdd.Config);
}
//ensure all HDDs are part of the same pool
var poolGuid = mHdds.Select(h => h.Config.Get <ulong>("pool_guid")).Distinct().ToArray();
if (poolGuid.Length != 1)
{
throw new Exception("Hard drives are part of different pools: " + string.Join(", ", poolGuid.Select(p => p.ToString())));
}
//ensure all HDDs agree on the transaction group id
var txg = mHdds.Select(hdd => hdd.Uberblock.Txg).Distinct().ToArray();
if (txg.Length != 1)
{
throw new Exception("Uberblocks do not all have the same transaction group id: " + string.Join(", ", txg.Select(p => p.ToString())));
}
var ub = mHdds[0].Uberblock;
if (ub.Txg == 0)
{
throw new Exception("Root block pointer's transaction group is zero!");
}
var vdevs = Vdev.CreateVdevTree(mHdds);
mZio = new Zio(vdevs);
mMos = new ObjectSet(mZio, mZio.Get <objset_phys_t>(ub.rootbp));
if (mMos.Type != dmu_objset_type_t.DMU_OST_META)
{
throw new Exception("Given block pointer did not point to the MOS.");
}
mZio.InitMetaSlabs(mMos);
//the second time we will make sure that space maps contain themselves
mZio.InitMetaSlabs(mMos);
var objectDirectory = mMos.ReadEntry(1);
//The MOS's directory sometimes has things that don't like like directory entries.
//For example, the "scan" entry has scrub status stuffed into as an array of longs.
mObjDir = Zap.GetDirectoryEntries(objectDirectory, true);
if (mObjDir.ContainsKey(DDT_STATISTICS))
{
var ddtStats = Zap.Parse(mMos.ReadEntry(mObjDir[DDT_STATISTICS]));
//TODO: maybe do something interesting with the stats
}
{
var configDn = mMos.ReadEntry(mObjDir[CONFIG]);
var configBytes = Program.RentBytes(checked ((int)configDn.AvailableDataSize));
configDn.Read(configBytes, 0);
mConfig = new NvList(configBytes);
Program.ReturnBytes(configBytes);
}
CheckVersion(mConfig);
CheckFeatures();
}
