IOCTL_MOUNTMGR_QUERY_POINTS questions

NTFSD
1

Hello,

I have two small questions about IOCTL_MOUNTMGR_QUERY_POINTS. I use
it to convert a device name into a mount point (
\Device\HarddiskVolume1 -> C: ). However, as the documentation
states, i get a MOUNTMGR_MOUNT_POINTS structure containing TWO
MOUNTMGR_MOUNT_POINT structures. The first structure contains a
GUID path “??\Volume{…}” as the SymbolicLinkName, while the
second structure contains the expected “\DosDevices\C:”.

The documentation states that if I call the IOCTL with only the
device name , i get “all associated mount points (symbolic links),
including the volume GUID pathname and the drive letters”.

The question is , can there be more drive letters to just one
device ( \Device\HarddiskVolume1 ) ? Also, in the common case of
one letter per device, can I rely on the SymbolicLinkName of the
second structure to be the one with the mount point ?

Is this the right way to create a device to mount point mapping ?

–
Best regards,
Alex mailto:xxxxx@bitdefender.com

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2

Alex:

As I recall, you’re doing a mini-filter, so check out FilterGetDosName():

“FilterGetDosName returns the volume’s drive letter if it has one. If no
drive letter is assigned to the volume, FilterGetDosName returns a path to a
volume mount point (also called a mount point name). If no drive letters or
mount points are defined for the volume, FilterGetDosName returns S_OK, and
lpVolumeName receives NULL.”

HTH,
Ken

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of Alex Carp
Sent: Wednesday, September 14, 2005 4:54 AM
To: Windows File Systems Devs Interest List
Subject: [ntfsd] IOCTL_MOUNTMGR_QUERY_POINTS questions

Hello,

I have two small questions about IOCTL_MOUNTMGR_QUERY_POINTS. I use
it to convert a device name into a mount point (
\Device\HarddiskVolume1 -> C: ). However, as the documentation
states, i get a MOUNTMGR_MOUNT_POINTS structure containing TWO
MOUNTMGR_MOUNT_POINT structures. The first structure contains a
GUID path “??\Volume{…}” as the SymbolicLinkName, while the
second structure contains the expected “\DosDevices\C:”.

The documentation states that if I call the IOCTL with only the
device name , i get “all associated mount points (symbolic links),
including the volume GUID pathname and the drive letters”.

The question is , can there be more drive letters to just one
device ( \Device\HarddiskVolume1 ) ? Also, in the common case of
one letter per device, can I rely on the SymbolicLinkName of the
second structure to be the one with the mount point ?

Is this the right way to create a device to mount point mapping ?

–
Best regards,
Alex mailto:xxxxx@bitdefender.com

–
This message was scanned for spam and viruses by BitDefender.
For more information please visit http://www.bitdefender.com/

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