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Date: Fri, 07 Nov 2008 15:41:16 +0100
Reply-To: "Christian Franke" <Christian DOT Franke AT t-online DOT de>
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Subject: Re: Mount of VSS volumes (//?/GLOBALROOT/...) does not work
From: "Christian Franke" <Christian DOT Franke AT t-online DOT de>
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Corinna Vinschen wrote:
> On Nov  7 13:06, Christian Franke wrote:
> > According to
> > http://sourceware.org/ml/cygwin/2007-05/msg00359.html
> > http://sourceware.org/ml/cygwin-patches/2006-q4/msg00008.html
> > Cygwin includes support to mount a //?/GLOBALROOT/... path
> 
> No, it doesn't.  It allows to *access* the path, but the mount call
> follows a somewhat different route.  You can only access the path
> directly (a concenssion to a necessity which has no POSIX equivalent)
> or, as you did, map the VSS volume to a drive letter.  The patch is
> not in 1.5.25, btw., only in 1.7.0.
> 

Thanks for clarification.

The access to the path works, except the access to the root dir of the
volume. It appears as a regular file which apparently provides raw read
access to the partition:

$ ls -l '//?/GLOBALROOT/Device/HarddiskVolumeShadowCopy1'
-rw-r--r-- 1 ... 0 Dec  1  2006 //?/.../HarddiskVolumeShadowCopy1

$ xxd '//?/GLOBALROOT/Device/HarddiskVolumeShadowCopy1'
0000000: eb52 904e 5446 5320 2020 2000 0208 0000  .R.NTFS    .....
...

$ ls -l '//?/GLOBALROOT/Device/HarddiskVolumeShadowCopy1/'
ls: cannot access //?/.../HarddiskVolumeShadowCopy1/: Not a directory

$ ls -l '//?/GLOBALROOT/Device/HarddiskVolumeShadowCopy1/.'
ls: cannot access //?/.../HarddiskVolumeShadowCopy1/.: Not a directory


Files/Dirs below the root dir can be accessed:

$ ls -l '//?/GLOBALROOT/Device/HarddiskVolumeShadowCopy1/boot.ini'
-rwx------+ 1 ... 429 Jun 12 16:10 //?/.../...VolumeShadowCopy1/boot.ini

$ ls -l '//?/GLOBALROOT/Device/HarddiskVolumeShadowCopy1/cygwin'
drwx------+ 1 ...    0 Oct 31 16:14 bin
drwx------+ 1 ...    0 Sep 12  2007 cygdrive
-rwx------+ 1 ...  209 Jun 19  2006 cygwin.bat
...


With a drive mapping, the root dir can be accessed:

$ dosdev v: '\\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy1'

$ ls -ld /cygdrive/v
drwxrwxr-x+ 1 ... 0 Nov  6 14:03 /cygdrive/v

$ ls -l /cygdrive/v
-rwx------+ 1 ... 429 Jun 12 16:10 boot.ini
...


Christian




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