On Aug 18 18:36, Lavrentiev, Anton (NIH/NLM/NCBI) [C] via Cygwin wrote:
> > And I just confirmed that if I print the context right before NtOpenFile(),
> > and just do
> > the "continue",
>
> But then I also tried this: I removed the "continue" before "NtOpenFile()"
> and allowed it to proceed,
> but I moved NtClose(devhdl) right after the "printf" statement (that we were
> tweaking), and
> inserted the "continue" there, so it does not proceed with enumerating of the
> partitions.
> And so again, I got the output that matches my disks without the duplication.
> So this actually
> exonerates NtOpenFile() :-)
>
> $ ./proc_partition
> context = 282
> major minor #blocks name win-mounts
>
> 8 0 500107608 sda (282, Harddisk0, 144)
> context = 299
> 8 16 1000204632 sdb (299, Harddisk1, 144)
> context = 314
> 8 32 1000204632 sdc (314, Harddisk2, 144)
> context = 329
> 8 48 1000204632 sdd (329, Harddisk3, 144)
> context = 339
> 8 64 234431064 sde (339, Harddisk4, 144)
> context = 352
> DeviceIoControl (Harddisk5\Partition0, IOCTL_DISK_GET_PARTITION_INFO{_EX}) 5
> 8 80 0 sdf (352, Harddisk5, 144)
Unfortunately I can't reproduce the issue. I created a couple of
virtual drives and added them to my W10 and my W7 VM, but to no avail.
The output always makes sense, e. g.,
$ ./proc_partition.exe
major minor #blocks name win-mounts
8 0 54525952 sda (169, Harddisk0)
8 1 102400 sda1
8 2 54420480 sda2 C:\
8 16 1048576 sdb (181, Harddisk1)
8 17 1045504 sdb1 E:\
8 32 1048576 sdc (189, Harddisk2)
8 33 32768 sdc1
8 34 1013760 sdc2 H:\
8 48 1048576 sdd (199, Harddisk3)
8 49 1045504 sdd1 F:\
8 64 1048576 sde (207, Harddisk4)
8 65 32768 sde1
8 66 1013760 sde2 G:\
The only interesting difference I can observe on Windows 7 is
that the offset changes quite often, compared to Windows 10.
I wonder if the Win32 API functions GetVolumeNameForVolumeMountPointW
or GetVolumePathNamesForVolumeNameW are the potiential culprit.
Can you apply the following patch, which disables the "win-mounts" output
and try again?
--- proc_partition.c.orig 2021-08-19 12:01:25.480105116 +0200
+++ proc_partition.c 2021-08-19 12:01:47.134099288 +0200
@@ -178,7 +178,7 @@ main ()
swprintf (fpath, sizeof fpath,
L"\\\\?\\GLOBALROOT\\Device\\%ls\\Partition%u\\",
dbi->ObjectName.Buffer, part_num);
- if (GetVolumeNameForVolumeMountPointW (fpath, gpath, MAX_PATH)
+ if (0 && GetVolumeNameForVolumeMountPointW (fpath, gpath, MAX_PATH)
&& GetVolumePathNamesForVolumeNameW (gpath, mp_buf,
NT_MAX_PATH, &len))
{
Thanks,
Corinna
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