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// Copyright 2019 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package disklayout
// SuperBlockOld implements SuperBlock and represents the old version of the
// superblock struct in ext2 and ext3 systems.
//
// The suffix `Lo` here stands for lower bits because this is also used in the
// 64-bit version where these fields represent the lower half of the fields.
// The suffix `Raw` has been added to indicate that the field does not have a
// counterpart in the 64-bit version and to resolve name collision with the
// interface.
type SuperBlockOld struct {
InodesCountRaw uint32
BlocksCountLo uint32
ReservedBlocksCount uint32
FreeBlocksCountLo uint32
FreeInodesCountRaw uint32
FirstDataBlockRaw uint32
LogBlockSize uint32
LogClusterSize uint32
BlocksPerGroupRaw uint32
ClustersPerGroupRaw uint32
InodesPerGroupRaw uint32
Mtime uint32
Wtime uint32
MountCountRaw uint16
MaxMountCountRaw uint16
MagicRaw uint16
State uint16
Errors uint16
MinorRevLevel uint16
LastCheck uint32
CheckInterval uint32
CreatorOS uint32
RevLevel uint32
DefResUID uint16
DefResGID uint16
}
// InodesCount implements SuperBlock.InodesCount.
func (sb *SuperBlockOld) InodesCount() uint32 { return sb.InodesCountRaw }
// BlocksCount implements SuperBlock.BlocksCount.
func (sb *SuperBlockOld) BlocksCount() uint64 { return uint64(sb.BlocksCountLo) }
// FreeBlocksCount implements SuperBlock.FreeBlocksCount.
func (sb *SuperBlockOld) FreeBlocksCount() uint64 { return uint64(sb.FreeBlocksCountLo) }
// FreeInodesCount implements SuperBlock.FreeInodesCount.
func (sb *SuperBlockOld) FreeInodesCount() uint32 { return sb.FreeInodesCountRaw }
// MountCount implements SuperBlock.MountCount.
func (sb *SuperBlockOld) MountCount() uint16 { return sb.MountCountRaw }
// MaxMountCount implements SuperBlock.MaxMountCount.
func (sb *SuperBlockOld) MaxMountCount() uint16 { return sb.MaxMountCountRaw }
// FirstDataBlock implements SuperBlock.FirstDataBlock.
func (sb *SuperBlockOld) FirstDataBlock() uint32 { return sb.FirstDataBlockRaw }
// BlockSize implements SuperBlock.BlockSize.
func (sb *SuperBlockOld) BlockSize() uint64 { return 1 << (10 + sb.LogBlockSize) }
// BlocksPerGroup implements SuperBlock.BlocksPerGroup.
func (sb *SuperBlockOld) BlocksPerGroup() uint32 { return sb.BlocksPerGroupRaw }
// ClusterSize implements SuperBlock.ClusterSize.
func (sb *SuperBlockOld) ClusterSize() uint64 { return 1 << (10 + sb.LogClusterSize) }
// ClustersPerGroup implements SuperBlock.ClustersPerGroup.
func (sb *SuperBlockOld) ClustersPerGroup() uint32 { return sb.ClustersPerGroupRaw }
// InodeSize implements SuperBlock.InodeSize.
func (sb *SuperBlockOld) InodeSize() uint16 { return 128 }
// InodesPerGroup implements SuperBlock.InodesPerGroup.
func (sb *SuperBlockOld) InodesPerGroup() uint32 { return sb.InodesPerGroupRaw }
// BgDescSize implements SuperBlock.BgDescSize.
func (sb *SuperBlockOld) BgDescSize() uint16 { return 32 }
// CompatibleFeatures implements SuperBlock.CompatibleFeatures.
func (sb *SuperBlockOld) CompatibleFeatures() CompatFeatures { return CompatFeatures{} }
// IncompatibleFeatures implements SuperBlock.IncompatibleFeatures.
func (sb *SuperBlockOld) IncompatibleFeatures() IncompatFeatures { return IncompatFeatures{} }
// ReadOnlyCompatibleFeatures implements SuperBlock.ReadOnlyCompatibleFeatures.
func (sb *SuperBlockOld) ReadOnlyCompatibleFeatures() RoCompatFeatures { return RoCompatFeatures{} }
// Magic implements SuperBlock.Magic.
func (sb *SuperBlockOld) Magic() uint16 { return sb.MagicRaw }
// Revision implements SuperBlock.Revision.
func (sb *SuperBlockOld) Revision() SbRevision { return SbRevision(sb.RevLevel) }
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