ReactOS 0.4.16-dev-1946-g52006dd
Classes | Macros | Typedefs | Functions
ext.h File Reference
#include <pshpack1.h>
#include <poppack.h>
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Classes

struct  _ExtSuperBlock
 
struct  _ExtGroupDescriptor
 
struct  _Ext4ExtentHeader
 
struct  _Ext4ExtentIdx
 
struct  _Ext4Extent
 
struct  _ExtInode
 
struct  _ExtDirEntry
 
struct  _EXT_FILE_INFO
 

Macros

#define EXT_SUPERBLOCK_MAGIC   0xEF53
 
#define EXT_DYNAMIC_REVISION   1
 
#define EXT_DEFAULT_INODE_SIZE   128
 
#define EXT_DEFAULT_GROUP_DESC_SIZE   32
 
#define EXT_DIR_ENTRY_MAX_NAME_LENGTH   255
 
#define EXT_ROOT_INODE   2
 
#define EXT_REVISION(sb)   (sb->RevisionLevel)
 
#define EXT_INODE_SIZE(sb)    (EXT_REVISION(sb) < EXT_DYNAMIC_REVISION ? EXT_DEFAULT_INODE_SIZE : sb->InodeSize)
 
#define EXT_GROUP_DESC_SIZE(sb)    ((EXT_REVISION(sb) >= EXT_DYNAMIC_REVISION && sb->GroupDescSize) ? sb->GroupDescSize : EXT_DEFAULT_GROUP_DESC_SIZE)
 
#define EXT4_INODE_FLAG_EXTENTS   0x80000
 
#define EXT4_EXTENT_HEADER_MAGIC   0xF30A
 
#define EXT4_EXTENT_MAX_LEVEL   5
 
#define EXT4_EXTENT_MAX_LENGTH   32768
 
#define FILETYPE_UNKNOWN   0
 
#define FILETYPE_REG   1
 
#define FILETYPE_DIRECTORY   2
 
#define FILETYPE_SYMLINK   7
 
#define FAST_SYMLINK_MAX_NAME_SIZE   60
 

Typedefs

typedef struct _ExtSuperBlock EXT_SUPER_BLOCK
 
typedef struct _ExtSuperBlock * PEXT_SUPER_BLOCK
 
typedef struct _ExtGroupDescriptor EXT_GROUP_DESC
 
typedef struct _ExtGroupDescriptor * PEXT_GROUP_DESC
 
typedef struct _Ext4ExtentHeader EXT4_EXTENT_HEADER
 
typedef struct _Ext4ExtentHeader * PEXT4_EXTENT_HEADER
 
typedef struct _Ext4ExtentIdx EXT4_EXTENT_IDX
 
typedef struct _Ext4ExtentIdx * PEXT4_EXTENT_IDX
 
typedef struct _Ext4Extent EXT4_EXTENT
 
typedef struct _Ext4Extent * PEXT4_EXTENT
 
typedef struct _ExtInode EXT_INODE
 
typedef struct _ExtInode * PEXT_INODE
 
typedef struct _ExtDirEntry EXT_DIR_ENTRY
 
typedef struct _ExtDirEntry * PEXT_DIR_ENTRY
 
typedef struct _EXT_VOLUME_INFO * PEXT_VOLUME_INFO
 
typedef struct _EXT_FILE_INFO EXT_FILE_INFO
 
typedef struct _EXT_FILE_INFO * PEXT_FILE_INFO
 

Functions

 C_ASSERT (sizeof(EXT_SUPER_BLOCK)==0x400)
 
ULONGLONG ExtGetVolumeSize (_In_ ULONG DeviceId)
 Returns the size of the EXT2/3/4 volume laid on the storage media device opened via DeviceId.
 
const DEVVTBL * ExtMount (ULONG DeviceId)
 

Macro Definition Documentation

◆ EXT4_EXTENT_HEADER_MAGIC

#define EXT4_EXTENT_HEADER_MAGIC   0xF30A

Definition at line 215 of file ext.h.

◆ EXT4_EXTENT_MAX_LENGTH

#define EXT4_EXTENT_MAX_LENGTH   32768

Definition at line 221 of file ext.h.

◆ EXT4_EXTENT_MAX_LEVEL

#define EXT4_EXTENT_MAX_LEVEL   5

Definition at line 218 of file ext.h.

◆ EXT4_INODE_FLAG_EXTENTS

#define EXT4_INODE_FLAG_EXTENTS   0x80000

Definition at line 212 of file ext.h.

◆ EXT_DEFAULT_GROUP_DESC_SIZE

#define EXT_DEFAULT_GROUP_DESC_SIZE   32

Definition at line 48 of file ext.h.

◆ EXT_DEFAULT_INODE_SIZE

#define EXT_DEFAULT_INODE_SIZE   128

Definition at line 47 of file ext.h.

◆ EXT_DIR_ENTRY_MAX_NAME_LENGTH

#define EXT_DIR_ENTRY_MAX_NAME_LENGTH   255

Definition at line 50 of file ext.h.

◆ EXT_DYNAMIC_REVISION

#define EXT_DYNAMIC_REVISION   1

Definition at line 46 of file ext.h.

◆ EXT_GROUP_DESC_SIZE

#define EXT_GROUP_DESC_SIZE (   sb)     ((EXT_REVISION(sb) >= EXT_DYNAMIC_REVISION && sb->GroupDescSize) ? sb->GroupDescSize : EXT_DEFAULT_GROUP_DESC_SIZE)

Definition at line 208 of file ext.h.

◆ EXT_INODE_SIZE

#define EXT_INODE_SIZE (   sb)     (EXT_REVISION(sb) < EXT_DYNAMIC_REVISION ? EXT_DEFAULT_INODE_SIZE : sb->InodeSize)

Definition at line 204 of file ext.h.

◆ EXT_REVISION

#define EXT_REVISION (   sb)    (sb->RevisionLevel)

Definition at line 201 of file ext.h.

◆ EXT_ROOT_INODE

#define EXT_ROOT_INODE   2

Definition at line 198 of file ext.h.

◆ EXT_SUPERBLOCK_MAGIC

#define EXT_SUPERBLOCK_MAGIC   0xEF53

Definition at line 45 of file ext.h.

◆ FAST_SYMLINK_MAX_NAME_SIZE

#define FAST_SYMLINK_MAX_NAME_SIZE   60

Definition at line 229 of file ext.h.

◆ FILETYPE_DIRECTORY

#define FILETYPE_DIRECTORY   2

Definition at line 226 of file ext.h.

◆ FILETYPE_REG

#define FILETYPE_REG   1

Definition at line 225 of file ext.h.

◆ FILETYPE_SYMLINK

#define FILETYPE_SYMLINK   7

Definition at line 227 of file ext.h.

◆ FILETYPE_UNKNOWN

#define FILETYPE_UNKNOWN   0

Definition at line 224 of file ext.h.

Typedef Documentation

◆ EXT4_EXTENT

typedef struct _Ext4Extent EXT4_EXTENT

◆ EXT4_EXTENT_HEADER

typedef struct _Ext4ExtentHeader EXT4_EXTENT_HEADER

◆ EXT4_EXTENT_IDX

typedef struct _Ext4ExtentIdx EXT4_EXTENT_IDX

◆ EXT_DIR_ENTRY

typedef struct _ExtDirEntry EXT_DIR_ENTRY

◆ EXT_FILE_INFO

typedef struct _EXT_FILE_INFO EXT_FILE_INFO

◆ EXT_GROUP_DESC

typedef struct _ExtGroupDescriptor EXT_GROUP_DESC

◆ EXT_INODE

typedef struct _ExtInode EXT_INODE

◆ EXT_SUPER_BLOCK

typedef struct _ExtSuperBlock EXT_SUPER_BLOCK

◆ PEXT4_EXTENT

typedef struct _Ext4Extent * PEXT4_EXTENT

◆ PEXT4_EXTENT_HEADER

typedef struct _Ext4ExtentHeader * PEXT4_EXTENT_HEADER

◆ PEXT4_EXTENT_IDX

typedef struct _Ext4ExtentIdx * PEXT4_EXTENT_IDX

◆ PEXT_DIR_ENTRY

typedef struct _ExtDirEntry * PEXT_DIR_ENTRY

◆ PEXT_FILE_INFO

typedef struct _EXT_FILE_INFO * PEXT_FILE_INFO

◆ PEXT_GROUP_DESC

typedef struct _ExtGroupDescriptor * PEXT_GROUP_DESC

◆ PEXT_INODE

typedef struct _ExtInode * PEXT_INODE

◆ PEXT_SUPER_BLOCK

typedef struct _ExtSuperBlock * PEXT_SUPER_BLOCK

◆ PEXT_VOLUME_INFO

typedef struct _EXT_VOLUME_INFO* PEXT_VOLUME_INFO

Definition at line 231 of file ext.h.

Function Documentation

◆ C_ASSERT()

C_ASSERT ( sizeof(EXT_SUPER_BLOCK)  = =0x400)

◆ ExtGetVolumeSize()

ULONGLONG ExtGetVolumeSize ( _In_ ULONG  DeviceId)

Returns the size of the EXT2/3/4 volume laid on the storage media device opened via DeviceId.

Definition at line 1404 of file ext.c.

1406{
1407 PEXT_VOLUME_INFO Volume;
1408 ULARGE_INTEGER BlocksCount;
1409
1410 Volume = ExtVolumes[DeviceId];
1411 ASSERT(Volume);
1412
1413 BlocksCount.LowPart = Volume->SuperBlock->BlocksCountLo;
1414 BlocksCount.HighPart = Volume->SuperBlock->BlocksCountHi;
1415
1416 /* NOTE: Volume->BlockSizeInBytes == Volume->BlockSizeInSectors * Volume->BytesPerSector */
1417 return BlocksCount.QuadPart * Volume->BlockSizeInBytes;
1418}
ExtVolumes
PEXT_VOLUME_INFO ExtVolumes[MAX_FDS]
Definition: ext.c:70
Volume
UNICODE_STRING Volume
Definition: fltkernel.h:1172
ASSERT
#define ASSERT(a)
Definition: mode.c:44
_EXT_VOLUME_INFO
Definition: ext.c:50
_ULARGE_INTEGER
Definition: ms-dtyp.idl:184
_ULARGE_INTEGER::LowPart
$ULONG LowPart
Definition: ntbasedef.h:581
_ULARGE_INTEGER::QuadPart
ULONGLONG QuadPart
Definition: ms-dtyp.idl:185
_ULARGE_INTEGER::HighPart
$ULONG HighPart
Definition: ntbasedef.h:582

Referenced by FsGetVolumeSize().

◆ ExtMount()

const DEVVTBL * ExtMount ( ULONG  DeviceId)

Definition at line 1431 of file ext.c.

1432{
1433 PEXT_VOLUME_INFO Volume;
1434 EXT_SUPER_BLOCK SuperBlock;
1435 LARGE_INTEGER Position;
1436 ULONG Count;
1437 ARC_STATUS Status;
1438
1439 TRACE("Enter ExtMount(%lu)\n", DeviceId);
1440
1441 /* Allocate data for volume information */
1442 Volume = FrLdrTempAlloc(sizeof(EXT_VOLUME_INFO), TAG_EXT_VOLUME);
1443 if (!Volume)
1444 return NULL;
1445 RtlZeroMemory(Volume, sizeof(EXT_VOLUME_INFO));
1446
1447 /* Read the SuperBlock */
1448 Position.QuadPart = 2 * 512;
1449 Status = ArcSeek(DeviceId, &Position, SeekAbsolute);
1450 if (Status != ESUCCESS)
1451 {
1452 FrLdrTempFree(Volume, TAG_EXT_VOLUME);
1453 return NULL;
1454 }
1455 Status = ArcRead(DeviceId, &SuperBlock, sizeof(SuperBlock), &Count);
1456 if (Status != ESUCCESS || Count != sizeof(SuperBlock))
1457 {
1458 FrLdrTempFree(Volume, TAG_EXT_VOLUME);
1459 return NULL;
1460 }
1461
1462 /* Check if SuperBlock is valid. If yes, return Ext function table. */
1463 if (SuperBlock.Magic != EXT_SUPERBLOCK_MAGIC)
1464 {
1465 FrLdrTempFree(Volume, TAG_EXT_VOLUME);
1466 return NULL;
1467 }
1468
1469 Volume->DeviceId = DeviceId;
1470
1471 /* Really open the volume */
1472 if (!ExtOpenVolume(Volume))
1473 {
1474 FrLdrTempFree(Volume, TAG_EXT_VOLUME);
1475 return NULL;
1476 }
1477
1478 /* Remember EXT volume information */
1479 ExtVolumes[DeviceId] = Volume;
1480
1481 /* Return success */
1482 TRACE("ExtMount(%lu) success\n", DeviceId);
1483 return &ExtFuncTable;
1484}
EXT_SUPERBLOCK_MAGIC
#define EXT_SUPERBLOCK_MAGIC
Definition: ext.h:45
ArcSeek
ARC_STATUS ArcSeek(ULONG FileId, LARGE_INTEGER *Position, SEEKMODE SeekMode)
Definition: fs.c:455
ArcRead
ARC_STATUS ArcRead(ULONG FileId, VOID *Buffer, ULONG N, ULONG *Count)
Definition: fs.c:448
FrLdrTempFree
VOID FrLdrTempFree(PVOID Allocation, ULONG Tag)
Definition: heap.c:553
FrLdrTempAlloc
PVOID FrLdrTempAlloc(_In_ SIZE_T Size, _In_ ULONG Tag)
Definition: heap.c:545
TAG_EXT_VOLUME
#define TAG_EXT_VOLUME
Definition: ext.c:77
ExtFuncTable
const DEVVTBL ExtFuncTable
Definition: ext.c:1421
ExtOpenVolume
BOOLEAN ExtOpenVolume(PEXT_VOLUME_INFO Volume)
Definition: ext.c:79
NULL
#define NULL
Definition: types.h:112
Status
Status
Definition: gdiplustypes.h:25
Count
int Count
Definition: noreturn.cpp:7
ESUCCESS
@ ESUCCESS
Definition: arc.h:32
ARC_STATUS
ULONG ARC_STATUS
Definition: arc.h:4
SeekAbsolute
@ SeekAbsolute
Definition: arc.h:59
TRACE
#define TRACE(s)
Definition: solgame.cpp:4
_ExtSuperBlock
Definition: ext.h:53
_ExtSuperBlock::Magic
USHORT Magic
Definition: ext.h:70
Position
static COORD Position
Definition: mouse.c:34
RtlZeroMemory
#define RtlZeroMemory(Destination, Length)
Definition: typedefs.h:262
ULONG
uint32_t ULONG
Definition: typedefs.h:59
_LARGE_INTEGER
Definition: typedefs.h:103