Documentation
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Index ¶
Constants ¶
const SuperBlockMagic uint16 = 0xef53
Variables ¶
This section is empty.
Functions ¶
func Ext4FileSystemSize ¶
func Ext4FileSystemSize(r io.ReadSeeker) (int64, int, error)
Ext4FileSystemSize reads ext4 superblock and returns the size of the underlying ext4 file system and its block size.
func IsDeviceExt4 ¶
IsDeviceExt4 is will read the device's superblock and determine if it is and ext4 superblock.
Types ¶
type CompatFeature ¶
type CompatFeature uint32
type IncompatFeature ¶
type IncompatFeature uint32
type RoCompatFeature ¶
type RoCompatFeature uint32
type SuperBlock ¶
type SuperBlock struct {
InodesCount uint32
BlocksCountLow uint32
RootBlocksCountLow uint32
FreeBlocksCountLow uint32
FreeInodesCount uint32
FirstDataBlock uint32
LogBlockSize uint32
LogClusterSize uint32
BlocksPerGroup uint32
ClustersPerGroup uint32
InodesPerGroup uint32
Mtime uint32
Wtime uint32
MountCount uint16
MaxMountCount uint16
Magic uint16
State uint16
Errors uint16
MinorRevisionLevel uint16
LastCheck uint32
CheckInterval uint32
CreatorOS uint32
RevisionLevel uint32
DefaultReservedUid uint16
DefaultReservedGid uint16
FirstInode uint32
InodeSize uint16
BlockGroupNr uint16
FeatureCompat CompatFeature
FeatureIncompat IncompatFeature
FeatureRoCompat RoCompatFeature
UUID [16]uint8
VolumeName [16]byte
LastMounted [64]byte
AlgorithmUsageBitmap uint32
PreallocBlocks uint8
PreallocDirBlocks uint8
ReservedGdtBlocks uint16
JournalUUID [16]uint8
JournalInum uint32
JournalDev uint32
LastOrphan uint32
HashSeed [4]uint32
DefHashVersion uint8
JournalBackupType uint8
DescSize uint16
DefaultMountOpts uint32
FirstMetaBg uint32
MkfsTime uint32
JournalBlocks [17]uint32
BlocksCountHigh uint32
RBlocksCountHigh uint32
FreeBlocksCountHigh uint32
MinExtraIsize uint16
WantExtraIsize uint16
Flags uint32
RaidStride uint16
MmpInterval uint16
MmpBlock uint64
RaidStripeWidth uint32
LogGroupsPerFlex uint8
ChecksumType uint8
ReservedPad uint16
KbytesWritten uint64
SnapshotInum uint32
SnapshotID uint32
SnapshotRBlocksCount uint64
SnapshotList uint32
ErrorCount uint32
FirstErrorTime uint32
FirstErrorInode uint32
FirstErrorBlock uint64
FirstErrorFunc [32]uint8
FirstErrorLine uint32
LastErrorTime uint32
LastErrorInode uint32
LastErrorLine uint32
LastErrorBlock uint64
LastErrorFunc [32]uint8
MountOpts [64]uint8
UserQuotaInum uint32
GroupQuotaInum uint32
OverheadBlocks uint32
BackupBgs [2]uint32
EncryptAlgos [4]uint8
EncryptPwSalt [16]uint8
LpfInode uint32
ProjectQuotaInum uint32
ChecksumSeed uint32
WtimeHigh uint8
MtimeHigh uint8
MkfsTimeHigh uint8
LastcheckHigh uint8
FirstErrorTimeHigh uint8
LastErrorTimeHigh uint8
Pad [2]uint8
Reserved [96]uint32
Checksum uint32
}
func ReadExt4SuperBlock ¶
func ReadExt4SuperBlock(devicePath string) (*SuperBlock, error)
ReadExt4SuperBlock reads and returns ext4 super block from given device.
func ReadExt4SuperBlockReadSeeker ¶
func ReadExt4SuperBlockReadSeeker(rsc io.ReadSeeker) (*SuperBlock, error)
ReadExt4SuperBlockReadSeeker reads and returns ext4 super block given an io.ReadSeeker.
The layout on disk is as follows: | Group 0 padding | - 1024 bytes | ext4 SuperBlock | - 1 block | Group Descriptors | - many blocks | Reserved GDT Blocks | - many blocks | Data Block Bitmap | - 1 block | inode Bitmap | - 1 block | inode Table | - many blocks | Data Blocks | - many blocks
More details can be found here https://ext4.wiki.kernel.org/index.php/Ext4_Disk_Layout
Our goal is to skip the Group 0 padding, read and return the ext4 SuperBlock
Source Files