ext2.h File Reference

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Classes
struct	ext2_sblock
struct	ext2_block_group
struct	ext2_inode
struct	ext2_dirent
struct	EXT2_FILE_INFO

Macros
#define	EXT2_MAGIC   0xEF53
#define	INDIRECT_BLOCKS   12
#define	EXT2_PATH_MAX   4096
#define	EXT2_MAX_SYMLINKCNT   8
#define	EXT2_GOOD_OLD_REVISION   0
#define	EXT2_DYNAMIC_REVISION   1
#define	EXT2_GOOD_OLD_INODE_SIZE   128
#define	FILETYPE_UNKNOWN   0
#define	FILETYPE_REG   1
#define	FILETYPE_DIRECTORY   2
#define	FILETYPE_SYMLINK   7
#define	FILETYPE_INO_MASK   0170000
#define	FILETYPE_INO_REG   0100000
#define	FILETYPE_INO_DIRECTORY   0040000
#define	FILETYPE_INO_SYMLINK   0120000
#define	EXT2_NAME_LEN   255
#define	EXT2_ROOT_INO   2
#define	EXT3_FEATURE_INCOMPAT_SUPP   0x0002
#define	LOG2_BLOCK_SIZE(sb)   (sb->log2_block_size + 10)
#define	EXT2_BLOCK_SIZE(sb)   (((SIZE_T)1) << LOG2_BLOCK_SIZE(sb))
#define	EXT2_REVISION(sb)   (sb->revision_level)
#define	EXT2_INODE_SIZE(sb)
#define	EXT2_DESC_PER_BLOCK(s)   (EXT2_BLOCK_SIZE(s) / sizeof(struct ext2_block_group))
#define	EXT2_S_IRWXO   0x0007
#define	EXT2_S_IXOTH   0x0001
#define	EXT2_S_IWOTH   0x0002
#define	EXT2_S_IROTH   0x0004
#define	EXT2_S_IRWXG   0x0038
#define	EXT2_S_IXGRP   0x0008
#define	EXT2_S_IWGRP   0x0010
#define	EXT2_S_IRGRP   0x0020
#define	EXT2_S_IRWXU   0x01C0
#define	EXT2_S_IXUSR   0x0040
#define	EXT2_S_IWUSR   0x0080
#define	EXT2_S_IRUSR   0x0100
#define	EXT2_S_ISVTX   0x0200
#define	EXT2_S_ISGID   0x0400
#define	EXT2_S_ISUID   0x0800
#define	EXT2_S_IFMT   0xF000
#define	EXT2_S_IFIFO   0x1000
#define	EXT2_S_IFCHR   0x2000
#define	EXT2_S_IFDIR   0x4000
#define	EXT2_S_IFBLK   0x6000
#define	EXT2_S_IFREG   0x8000
#define	EXT2_S_IFLNK   0xA000
#define	EXT2_S_IFSOCK   0xC000
#define	FAST_SYMLINK_MAX_NAME_SIZE   60

Typedefs
typedef struct ext2_sblock	EXT2_SUPER_BLOCK
typedef struct ext2_sblock *	PEXT2_SUPER_BLOCK
typedef struct ext2_inode	EXT2_INODE
typedef struct ext2_inode *	PEXT2_INODE
typedef struct ext2_block_group	EXT2_GROUP_DESC
typedef struct ext2_block_group *	PEXT2_GROUP_DESC
typedef struct ext2_dirent	EXT2_DIR_ENTRY
typedef struct ext2_dirent *	PEXT2_DIR_ENTRY
typedef struct _EXT2_VOLUME_INFO *	PEXT2_VOLUME_INFO
typedef struct EXT2_FILE_INFO *	PEXT2_FILE_INFO

Functions
const DEVVTBL *	Ext2Mount (ULONG DeviceId)

Macro Definition Documentation

EXT2_BLOCK_SIZE

#define EXT2_BLOCK_SIZE

(

sb

)

(((SIZE_T)1) << LOG2_BLOCK_SIZE(sb))

Definition at line 186 of file ext2.h.

EXT2_DESC_PER_BLOCK

#define EXT2_DESC_PER_BLOCK

(

s

)

(EXT2_BLOCK_SIZE(s) / sizeof(struct ext2_block_group))

Definition at line 196 of file ext2.h.

EXT2_DYNAMIC_REVISION

#define EXT2_DYNAMIC_REVISION   1

Definition at line 53 of file ext2.h.

EXT2_GOOD_OLD_INODE_SIZE

#define EXT2_GOOD_OLD_INODE_SIZE   128

Definition at line 54 of file ext2.h.

EXT2_GOOD_OLD_REVISION

#define EXT2_GOOD_OLD_REVISION   0

Definition at line 52 of file ext2.h.

EXT2_INODE_SIZE

#define EXT2_INODE_SIZE

(

sb

)

Value:

                (EXT2_REVISION(sb) == EXT2_GOOD_OLD_REVISION \
                ? EXT2_GOOD_OLD_INODE_SIZE \
                : sb->inode_size)

Definition at line 192 of file ext2.h.

EXT2_MAGIC

#define EXT2_MAGIC   0xEF53

Definition at line 43 of file ext2.h.

EXT2_MAX_SYMLINKCNT

#define EXT2_MAX_SYMLINKCNT   8

Definition at line 49 of file ext2.h.

EXT2_NAME_LEN

#define EXT2_NAME_LEN   255

Definition at line 156 of file ext2.h.

EXT2_PATH_MAX

#define EXT2_PATH_MAX   4096

Definition at line 47 of file ext2.h.

EXT2_REVISION

#define EXT2_REVISION

(

sb

)

(sb->revision_level)

Definition at line 189 of file ext2.h.

EXT2_ROOT_INO

#define EXT2_ROOT_INO   2

Definition at line 177 of file ext2.h.

EXT2_S_IFBLK

#define EXT2_S_IFBLK   0x6000

Definition at line 222 of file ext2.h.

EXT2_S_IFCHR

#define EXT2_S_IFCHR   0x2000

Definition at line 220 of file ext2.h.

EXT2_S_IFDIR

#define EXT2_S_IFDIR   0x4000

Definition at line 221 of file ext2.h.

EXT2_S_IFIFO

#define EXT2_S_IFIFO   0x1000

Definition at line 219 of file ext2.h.

EXT2_S_IFLNK

#define EXT2_S_IFLNK   0xA000

Definition at line 224 of file ext2.h.

EXT2_S_IFMT

#define EXT2_S_IFMT   0xF000

Definition at line 218 of file ext2.h.

EXT2_S_IFREG

#define EXT2_S_IFREG   0x8000

Definition at line 223 of file ext2.h.

EXT2_S_IFSOCK

#define EXT2_S_IFSOCK   0xC000

Definition at line 225 of file ext2.h.

EXT2_S_IRGRP

#define EXT2_S_IRGRP   0x0020

Definition at line 207 of file ext2.h.

EXT2_S_IROTH

#define EXT2_S_IROTH   0x0004

Definition at line 202 of file ext2.h.

EXT2_S_IRUSR

#define EXT2_S_IRUSR   0x0100

Definition at line 212 of file ext2.h.

EXT2_S_IRWXG

#define EXT2_S_IRWXG   0x0038

Definition at line 204 of file ext2.h.

EXT2_S_IRWXO

#define EXT2_S_IRWXO   0x0007

Definition at line 199 of file ext2.h.

EXT2_S_IRWXU

#define EXT2_S_IRWXU   0x01C0

Definition at line 209 of file ext2.h.

EXT2_S_ISGID

#define EXT2_S_ISGID   0x0400

Definition at line 215 of file ext2.h.

EXT2_S_ISUID

#define EXT2_S_ISUID   0x0800

Definition at line 216 of file ext2.h.

EXT2_S_ISVTX

#define EXT2_S_ISVTX   0x0200

Definition at line 214 of file ext2.h.

EXT2_S_IWGRP

#define EXT2_S_IWGRP   0x0010

Definition at line 206 of file ext2.h.

EXT2_S_IWOTH

#define EXT2_S_IWOTH   0x0002

Definition at line 201 of file ext2.h.

EXT2_S_IWUSR

#define EXT2_S_IWUSR   0x0080

Definition at line 211 of file ext2.h.

EXT2_S_IXGRP

#define EXT2_S_IXGRP   0x0008

Definition at line 205 of file ext2.h.

EXT2_S_IXOTH

#define EXT2_S_IXOTH   0x0001

Definition at line 200 of file ext2.h.

EXT2_S_IXUSR

#define EXT2_S_IXUSR   0x0040

Definition at line 210 of file ext2.h.

EXT3_FEATURE_INCOMPAT_SUPP

#define EXT3_FEATURE_INCOMPAT_SUPP   0x0002

Definition at line 180 of file ext2.h.

FAST_SYMLINK_MAX_NAME_SIZE

#define FAST_SYMLINK_MAX_NAME_SIZE   60

Definition at line 227 of file ext2.h.

FILETYPE_DIRECTORY

#define FILETYPE_DIRECTORY   2

Definition at line 59 of file ext2.h.

FILETYPE_INO_DIRECTORY

#define FILETYPE_INO_DIRECTORY   0040000

Definition at line 65 of file ext2.h.

FILETYPE_INO_MASK

#define FILETYPE_INO_MASK   0170000

Definition at line 63 of file ext2.h.

FILETYPE_INO_REG

#define FILETYPE_INO_REG   0100000

Definition at line 64 of file ext2.h.

FILETYPE_INO_SYMLINK

#define FILETYPE_INO_SYMLINK   0120000

Definition at line 66 of file ext2.h.

FILETYPE_REG

#define FILETYPE_REG   1

Definition at line 58 of file ext2.h.

FILETYPE_SYMLINK

#define FILETYPE_SYMLINK   7

Definition at line 60 of file ext2.h.

FILETYPE_UNKNOWN

#define FILETYPE_UNKNOWN   0

Definition at line 57 of file ext2.h.

INDIRECT_BLOCKS

#define INDIRECT_BLOCKS   12

Definition at line 45 of file ext2.h.

LOG2_BLOCK_SIZE

#define LOG2_BLOCK_SIZE

(

sb

)

(sb->log2_block_size + 10)

Definition at line 183 of file ext2.h.

Typedef Documentation

EXT2_DIR_ENTRY

typedef struct ext2_dirent EXT2_DIR_ENTRY

Definition at line 174 of file ext2.h.

EXT2_GROUP_DESC

typedef struct ext2_block_group EXT2_GROUP_DESC

Definition at line 173 of file ext2.h.

EXT2_INODE

typedef struct ext2_inode EXT2_INODE

Definition at line 172 of file ext2.h.

EXT2_SUPER_BLOCK

typedef struct ext2_sblock EXT2_SUPER_BLOCK

Definition at line 171 of file ext2.h.

PEXT2_DIR_ENTRY

typedef struct ext2_dirent * PEXT2_DIR_ENTRY

Definition at line 174 of file ext2.h.

PEXT2_FILE_INFO

typedef struct EXT2_FILE_INFO * PEXT2_FILE_INFO

PEXT2_GROUP_DESC

typedef struct ext2_block_group * PEXT2_GROUP_DESC

Definition at line 173 of file ext2.h.

PEXT2_INODE

typedef struct ext2_inode * PEXT2_INODE

Definition at line 172 of file ext2.h.

PEXT2_SUPER_BLOCK

typedef struct ext2_sblock * PEXT2_SUPER_BLOCK

Definition at line 171 of file ext2.h.

PEXT2_VOLUME_INFO

typedef struct _EXT2_VOLUME_INFO* PEXT2_VOLUME_INFO

Definition at line 229 of file ext2.h.

Function Documentation

Ext2Mount()

const DEVVTBL * Ext2Mount

(

ULONG

DeviceId

)

Definition at line 1295 of file ext2.c.

{
    PEXT2_VOLUME_INFO Volume;
    EXT2_SUPER_BLOCK SuperBlock;
    LARGE_INTEGER Position;
    ULONG Count;
    ARC_STATUS Status;
 
    TRACE("Enter Ext2Mount(%lu)\n", DeviceId);
 
    /* Allocate data for volume information */
    Volume = FrLdrTempAlloc(sizeof(EXT2_VOLUME_INFO), TAG_EXT_VOLUME);
    if (!Volume)
        return NULL;
    RtlZeroMemory(Volume, sizeof(EXT2_VOLUME_INFO));
 
    /* Read the SuperBlock */
    Position.QuadPart = 2 * 512;
    Status = ArcSeek(DeviceId, &Position, SeekAbsolute);
    if (Status != ESUCCESS)
    {
        FrLdrTempFree(Volume, TAG_EXT_VOLUME);
        return NULL;
    }
    Status = ArcRead(DeviceId, &SuperBlock, sizeof(SuperBlock), &Count);
    if (Status != ESUCCESS || Count != sizeof(SuperBlock))
    {
        FrLdrTempFree(Volume, TAG_EXT_VOLUME);
        return NULL;
    }
 
    /* Check if SuperBlock is valid. If yes, return Ext2 function table. */
    if (SuperBlock.magic != EXT2_MAGIC)
    {
        FrLdrTempFree(Volume, TAG_EXT_VOLUME);
        return NULL;
    }
 
    Volume->DeviceId = DeviceId;
 
    /* Really open the volume */
    if (!Ext2OpenVolume(Volume))
    {
        FrLdrTempFree(Volume, TAG_EXT_VOLUME);
        return NULL;
    }
 
    /* Remember EXT2 volume information */
    Ext2Volumes[DeviceId] = Volume;
 
    /* Return success */
    TRACE("Ext2Mount(%lu) success\n", DeviceId);
    return &Ext2FuncTable;
}

Referenced by ArcOpen().