96 lines
3.3 KiB
Go
96 lines
3.3 KiB
Go
// Copyright 2019 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package disklayout
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// SuperBlock64Bit implements SuperBlock and represents the 64-bit version of
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// the ext4_super_block struct in fs/ext4/ext4.h. This sums up to be exactly
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// 1024 bytes (smallest possible block size) and hence the superblock always
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// fits in no more than one data block. Should only be used when the 64-bit
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// feature is set.
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type SuperBlock64Bit struct {
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// We embed the 32-bit struct here because 64-bit version is just an extension
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// of the 32-bit version.
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SuperBlock32Bit
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BlocksCountHi uint32
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ReservedBlocksCountHi uint32
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FreeBlocksCountHi uint32
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MinInodeSize uint16
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WantInodeSize uint16
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Flags uint32
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RaidStride uint16
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MmpInterval uint16
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MmpBlock uint64
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RaidStripeWidth uint32
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LogGroupsPerFlex uint8
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ChecksumType uint8
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_ uint16
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KbytesWritten uint64
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SnapshotInum uint32
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SnapshotID uint32
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SnapshotRsrvBlocksCount uint64
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SnapshotList uint32
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ErrorCount uint32
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FirstErrorTime uint32
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FirstErrorInode uint32
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FirstErrorBlock uint64
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FirstErrorFunction [32]byte
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FirstErrorLine uint32
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LastErrorTime uint32
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LastErrorInode uint32
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LastErrorLine uint32
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LastErrorBlock uint64
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LastErrorFunction [32]byte
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MountOpts [64]byte
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UserQuotaInum uint32
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GroupQuotaInum uint32
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OverheadBlocks uint32
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BackupBgs [2]uint32
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EncryptAlgos [4]uint8
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EncryptPwSalt [16]uint8
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LostFoundInode uint32
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ProjectQuotaInode uint32
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ChecksumSeed uint32
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WtimeHi uint8
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MtimeHi uint8
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MkfsTimeHi uint8
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LastCheckHi uint8
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FirstErrorTimeHi uint8
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LastErrorTimeHi uint8
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_ [2]uint8
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Encoding uint16
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EncodingFlags uint16
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_ [95]uint32
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Checksum uint32
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}
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// Compiles only if SuperBlock64Bit implements SuperBlock.
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var _ SuperBlock = (*SuperBlock64Bit)(nil)
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// Only override methods which change based on the 64-bit feature.
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// BlocksCount implements SuperBlock.BlocksCount.
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func (sb *SuperBlock64Bit) BlocksCount() uint64 {
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return (uint64(sb.BlocksCountHi) << 32) | uint64(sb.BlocksCountLo)
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}
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// FreeBlocksCount implements SuperBlock.FreeBlocksCount.
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func (sb *SuperBlock64Bit) FreeBlocksCount() uint64 {
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return (uint64(sb.FreeBlocksCountHi) << 32) | uint64(sb.FreeBlocksCountLo)
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}
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// BgDescSize implements SuperBlock.BgDescSize.
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func (sb *SuperBlock64Bit) BgDescSize() uint16 { return sb.BgDescSizeRaw }
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