Function Ext2ReadDisk

Ext4Fsd/block.c:538–585

NTSTATUS
Ext2ReadDisk(
    IN PEXT2_VCB   Vcb,
    IN ULONGLONG   Offset,
    IN ULONG       Size,
    IN PVOID       Buffer,
    IN BOOLEAN     bVerify )
{
    NTSTATUS    Status;
    PUCHAR      Buf;
    ULONG       Length;
    ULONGLONG   Lba;

    Lba = Offset & (~((ULONGLONG)SECTOR_SIZE - 1));
    Length = (ULONG)(Size + Offset + SECTOR_SIZE - 1 - Lba) &
             (~((ULONG)SECTOR_SIZE - 1));

    Buf = Ext2AllocatePool(PagedPool, Length, EXT2_DATA_MAGIC);
    if (!Buf) {
        DEBUG(DL_ERR, ( "Ext2ReadDisk: failed to allocate Buffer.\n"));
        Status = STATUS_INSUFFICIENT_RESOURCES;

        goto errorout;
    }
    INC_MEM_COUNT(PS_DISK_BUFFER, Buf, Length);

    Status = Ext2ReadSync(  Vcb,
                            Lba,
                            Length,
                            Buf,
                            FALSE );

    if (!NT_SUCCESS(Status)) {
        DEBUG(DL_ERR, ("Ext2ReadDisk: disk i/o error: %xh.\n", Status));
        goto errorout;
    }

    RtlCopyMemory(Buffer, &Buf[Offset - Lba], Size);

errorout:

    if (Buf) {
        Ext2FreePool(Buf, EXT2_DATA_MAGIC);
        DEC_MEM_COUNT(PS_DISK_BUFFER, Buf, Length);
    }

    return Status;
}


NTSTATUS