Re: [coLinux-users] How to access a logical partition

[Henry N. <Hen...@Ar...>]

Harald Weidner wrote:
>>> colinux:~# cat /dev/cobd2
>>> cat: /dev/cobd2: No such device
> 
> [...]
> 
>> If not, run the coLinux debugger to see more about problems an the
>> windows detailed error message. Run the debugger:
>>  colinux-debug-daemon.exe -d -p -s prints=31,misc=31 -f debug.xml
>> Than try to read one block.
>> Stop the debugger. Open the file debug.xml with IE or notepad. Typicaly
>> at the end you should see the error from block device read and the
>> Windows internal error code.
> 
> The according messages are:
> 
> - <log module="colinux-driver" file="src/colinux/os/winnt/kernel/block.c"
>   timestamp="00000016.3900969652" local_index="668" facility="0"
>   function="co_os_file_block_get_size" line="212" level="10"
>   driver_index="802">
>   <string>device \Device\Harddisk0\Partition4</string> 
>   </log>
> - <log module="colinux-driver" file="src/colinux/os/winnt/kernel/block.c"
>   timestamp="00000016.3900971984" local_index="669" facility="0"
>   function="co_os_file_block_detect_size_harddisk" line="154" level="10"
>   driver_index="803">
>   <string>fail status C000000E</string> 
>   </log>

The translated error message from include/ddk/ntstatus.h:
STATUS_NO_SUCH_DEVICE ((NTSTATUS)0xC000000EL)
That means the ZwDeviceIoControlFile(..., IOCTL_DISK_GET_LENGTH_INFO,
...) does not work. That's harmless.

> - <log module="colinux-driver" file="src/colinux/os/winnt/kernel/block.c"
>   timestamp="00000016.3900972192" local_index="670" facility="0"
>   function="co_os_file_block_detect_size_binary_search" line="99" level="3"
>   driver_index="804">
>   <string>size is zero</string> 
>   </log>

coLinux can copen the devie but can't ead any?
Is the device locked? Is the device opened by Windows perhaps?

Please try to read a block with the windows variant of dd:
  dd.exe if=\Device\Harddisk0\Partition4 of=foo bs=512 count=1

Try the official names "\\?\Device\Harddisk0\Partition4" or
"\\?\Device\HarddiskVolume4", as you have seen from dd --list.

-- 
Henry N.