mirror of
https://github.com/netbirdio/gvisor.git
synced 2026-05-22 17:12:49 -07:00
ext4: disklayout: SuperBlock interface implementations.
PiperOrigin-RevId: 255687771
This commit is contained in:
Ayush Ranjan
gVisor bot
@@ -9,14 +9,21 @@ go_library(
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"block_group_32.go",
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"block_group_64.go",
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"superblock.go",
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"superblock_32.go",
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"superblock_64.go",
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"superblock_old.go",
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"test_utils.go",
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],
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importpath = "gvisor.dev/gvisor/pkg/sentry/fs/ext4/disklayout",
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deps = ["//pkg/binary"],
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)
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go_test(
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name = "disklayout_test",
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size = "small",
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srcs = ["block_group_test.go"],
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srcs = [
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"block_group_test.go",
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"superblock_test.go",
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],
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embed = [":disklayout"],
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deps = ["//pkg/binary"],
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)
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@@ -16,19 +16,11 @@ package disklayout
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import (
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"testing"
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"gvisor.dev/gvisor/pkg/binary"
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)
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// TestBlockGroupSize tests the fact that the block group struct for
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// 32-bit ext filesystems should be exactly 32 bytes big and for 64-bit fs it
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// should be 64 bytes.
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// TestBlockGroupSize tests that the block group descriptor structs are of the
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// correct size.
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func TestBlockGroupSize(t *testing.T) {
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if got, want := int(binary.Size(BlockGroup32Bit{})), 32; got != want {
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t.Errorf("BlockGroup32Bit should be exactly 32 bytes but is %d bytes", got)
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}
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if got, want := int(binary.Size(BlockGroup64Bit{})), 64; got != want {
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t.Errorf("BlockGroup64Bit should be exactly 64 bytes but is %d bytes", got)
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}
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assertSize(t, BlockGroup32Bit{}, 32)
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assertSize(t, BlockGroup64Bit{}, 64)
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}
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@@ -0,0 +1,76 @@
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// 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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// SuperBlock32Bit implements SuperBlock and represents the 32-bit version of
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// the ext4_super_block struct in fs/ext4/ext4.h.
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//
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// The suffix `Raw` has been added to indicate that the field does not have a
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// counterpart in the 64-bit version and to resolve name collision with the
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// interface.
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type SuperBlock32Bit struct {
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// We embed the old superblock struct here because the 32-bit version is just
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// an extension of the old version.
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SuperBlockOld
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FirstInode uint32
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InodeSizeRaw uint16
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BlockGroupNumber uint16
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FeatureCompat uint32
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FeatureIncompat uint32
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FeatureRoCompat uint32
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UUID [16]byte
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VolumeName [16]byte
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LastMounted [64]byte
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AlgoUsageBitmap uint32
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PreallocBlocks uint8
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PreallocDirBlocks uint8
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ReservedGdtBlocks uint16
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JournalUUID [16]byte
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JournalInum uint32
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JournalDev uint32
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LastOrphan uint32
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HashSeed [4]uint32
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DefaultHashVersion uint8
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JnlBackupType uint8
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BgDescSizeRaw uint16
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DefaultMountOpts uint32
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FirstMetaBg uint32
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MkfsTime uint32
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JnlBlocks [17]uint32
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}
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// Only override methods which change based on the additional fields above.
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// Not overriding SuperBlock.BgDescSize because it would still return 32 here.
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// InodeSize implements SuperBlock.InodeSize.
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func (sb *SuperBlock32Bit) InodeSize() uint16 {
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return sb.InodeSizeRaw
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}
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// CompatibleFeatures implements SuperBlock.CompatibleFeatures.
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func (sb *SuperBlock32Bit) CompatibleFeatures() CompatFeatures {
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return CompatFeaturesFromInt(sb.FeatureCompat)
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}
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// IncompatibleFeatures implements SuperBlock.IncompatibleFeatures.
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func (sb *SuperBlock32Bit) IncompatibleFeatures() IncompatFeatures {
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return IncompatFeaturesFromInt(sb.FeatureIncompat)
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}
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// ReadOnlyCompatibleFeatures implements SuperBlock.ReadOnlyCompatibleFeatures.
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func (sb *SuperBlock32Bit) ReadOnlyCompatibleFeatures() RoCompatFeatures {
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return RoCompatFeaturesFromInt(sb.FeatureRoCompat)
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}
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@@ -0,0 +1,94 @@
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// 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.
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//
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// The suffix `Hi` here stands for upper bits because they represent the upper
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// half of the fields.
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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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// 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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@@ -0,0 +1,108 @@
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// 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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// SuperBlockOld implements SuperBlock and represents the old version of the
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// superblock struct in ext2 and ext3 systems.
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//
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// The suffix `Lo` here stands for lower bits because this is also used in the
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// 64-bit version where these fields represent the lower half of the fields.
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// The suffix `Raw` has been added to indicate that the field does not have a
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// counterpart in the 64-bit version and to resolve name collision with the
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// interface.
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type SuperBlockOld struct {
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InodesCountRaw uint32
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BlocksCountLo uint32
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ReservedBlocksCount uint32
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FreeBlocksCountLo uint32
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FreeInodesCountRaw uint32
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FirstDataBlockRaw uint32
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LogBlockSize uint32
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LogClusterSize uint32
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BlocksPerGroupRaw uint32
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ClustersPerGroupRaw uint32
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InodesPerGroupRaw uint32
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Mtime uint32
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Wtime uint32
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MountCountRaw uint16
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MaxMountCountRaw uint16
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MagicRaw uint16
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State uint16
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Errors uint16
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MinorRevLevel uint16
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LastCheck uint32
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CheckInterval uint32
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CreatorOS uint32
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RevLevel uint32
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DefResUID uint16
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DefResGID uint16
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}
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// InodesCount implements SuperBlock.InodesCount.
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func (sb *SuperBlockOld) InodesCount() uint32 { return sb.InodesCountRaw }
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// BlocksCount implements SuperBlock.BlocksCount.
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func (sb *SuperBlockOld) BlocksCount() uint64 { return uint64(sb.BlocksCountLo) }
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// FreeBlocksCount implements SuperBlock.FreeBlocksCount.
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func (sb *SuperBlockOld) FreeBlocksCount() uint64 { return uint64(sb.FreeBlocksCountLo) }
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// FreeInodesCount implements SuperBlock.FreeInodesCount.
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func (sb *SuperBlockOld) FreeInodesCount() uint32 { return sb.FreeInodesCountRaw }
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// MountCount implements SuperBlock.MountCount.
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func (sb *SuperBlockOld) MountCount() uint16 { return sb.MountCountRaw }
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// MaxMountCount implements SuperBlock.MaxMountCount.
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func (sb *SuperBlockOld) MaxMountCount() uint16 { return sb.MaxMountCountRaw }
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// FirstDataBlock implements SuperBlock.FirstDataBlock.
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func (sb *SuperBlockOld) FirstDataBlock() uint32 { return sb.FirstDataBlockRaw }
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// BlockSize implements SuperBlock.BlockSize.
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func (sb *SuperBlockOld) BlockSize() uint64 { return 1 << (10 + sb.LogBlockSize) }
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// BlocksPerGroup implements SuperBlock.BlocksPerGroup.
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func (sb *SuperBlockOld) BlocksPerGroup() uint32 { return sb.BlocksPerGroupRaw }
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// ClusterSize implements SuperBlock.ClusterSize.
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func (sb *SuperBlockOld) ClusterSize() uint64 { return 1 << (10 + sb.LogClusterSize) }
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// ClustersPerGroup implements SuperBlock.ClustersPerGroup.
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func (sb *SuperBlockOld) ClustersPerGroup() uint32 { return sb.ClustersPerGroupRaw }
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// InodeSize implements SuperBlock.InodeSize.
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func (sb *SuperBlockOld) InodeSize() uint16 { return 128 }
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// InodesPerGroup implements SuperBlock.InodesPerGroup.
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func (sb *SuperBlockOld) InodesPerGroup() uint32 { return sb.InodesPerGroupRaw }
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// BgDescSize implements SuperBlock.BgDescSize.
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func (sb *SuperBlockOld) BgDescSize() uint16 { return 32 }
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// CompatibleFeatures implements SuperBlock.CompatibleFeatures.
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func (sb *SuperBlockOld) CompatibleFeatures() CompatFeatures { return CompatFeatures{} }
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// IncompatibleFeatures implements SuperBlock.IncompatibleFeatures.
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func (sb *SuperBlockOld) IncompatibleFeatures() IncompatFeatures { return IncompatFeatures{} }
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// ReadOnlyCompatibleFeatures implements SuperBlock.ReadOnlyCompatibleFeatures.
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func (sb *SuperBlockOld) ReadOnlyCompatibleFeatures() RoCompatFeatures { return RoCompatFeatures{} }
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// Magic implements SuperBlock.Magic.
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func (sb *SuperBlockOld) Magic() uint16 { return sb.MagicRaw }
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// Revision implements SuperBlock.Revision.
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func (sb *SuperBlockOld) Revision() SbRevision { return SbRevision(sb.RevLevel) }
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@@ -0,0 +1,27 @@
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// 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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import (
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"testing"
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)
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// TestSuperBlockSize tests that the superblock structs are of the correct
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// size.
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func TestSuperBlockSize(t *testing.T) {
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assertSize(t, SuperBlockOld{}, 84)
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assertSize(t, SuperBlock32Bit{}, 336)
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assertSize(t, SuperBlock64Bit{}, 1024)
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}
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@@ -0,0 +1,30 @@
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// 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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import (
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"reflect"
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"testing"
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"gvisor.dev/gvisor/pkg/binary"
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)
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func assertSize(t *testing.T, v interface{}, want uintptr) {
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t.Helper()
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if got := binary.Size(v); got != want {
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t.Errorf("struct %s should be exactly %d bytes but is %d bytes", reflect.TypeOf(v).Name(), want, got)
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}
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}
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Block a user