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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
// SuperBlock64Bit implements SuperBlock and represents the 64-bit version of
// the ext4_super_block struct in fs/ext4/ext4.h. This sums up to be exactly
// 1024 bytes (smallest possible block size) and hence the superblock always
// fits in no more than one data block.
//
// The suffix `Hi` here stands for upper bits because they represent the upper
// half of the fields.
type SuperBlock64Bit struct {
// We embed the 32-bit struct here because 64-bit version is just an extension
// of the 32-bit version.
SuperBlock32Bit
BlocksCountHi uint32
ReservedBlocksCountHi uint32
FreeBlocksCountHi uint32
MinInodeSize uint16
WantInodeSize uint16
Flags uint32
RaidStride uint16
MmpInterval uint16
MmpBlock uint64
RaidStripeWidth uint32
LogGroupsPerFlex uint8
ChecksumType uint8
_ uint16
KbytesWritten uint64
SnapshotInum uint32
SnapshotID uint32
SnapshotRsrvBlocksCount uint64
SnapshotList uint32
ErrorCount uint32
FirstErrorTime uint32
FirstErrorInode uint32
FirstErrorBlock uint64
FirstErrorFunction [32]byte
FirstErrorLine uint32
LastErrorTime uint32
LastErrorInode uint32
LastErrorLine uint32
LastErrorBlock uint64
LastErrorFunction [32]byte
MountOpts [64]byte
UserQuotaInum uint32
GroupQuotaInum uint32
OverheadBlocks uint32
BackupBgs [2]uint32
EncryptAlgos [4]uint8
EncryptPwSalt [16]uint8
LostFoundInode uint32
ProjectQuotaInode uint32
ChecksumSeed uint32
WtimeHi uint8
MtimeHi uint8
MkfsTimeHi uint8
LastCheckHi uint8
FirstErrorTimeHi uint8
LastErrorTimeHi uint8
_ [2]uint8
Encoding uint16
EncodingFlags uint16
_ [95]uint32
Checksum uint32
}
// Only override methods which change based on the 64-bit feature.
// BlocksCount implements SuperBlock.BlocksCount.
func (sb *SuperBlock64Bit) BlocksCount() uint64 {
return (uint64(sb.BlocksCountHi) << 32) | uint64(sb.BlocksCountLo)
}
// FreeBlocksCount implements SuperBlock.FreeBlocksCount.
func (sb *SuperBlock64Bit) FreeBlocksCount() uint64 {
return (uint64(sb.FreeBlocksCountHi) << 32) | uint64(sb.FreeBlocksCountLo)
}
// BgDescSize implements SuperBlock.BgDescSize.
func (sb *SuperBlock64Bit) BgDescSize() uint16 { return sb.BgDescSizeRaw }
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