[PATCH v7 4/6] ntoskrnl.exe: Implement volume information queries for device files.

[Erich E. Hoover]

This patch implements volume information queries for device files,
which allows NtQueryVolumeInformationFile to issue
IRP_MJ_QUERY_VOLUME_INFORMATION to return volume information from a
driver.  The patch also now includes a simple test that issues
FileFsVolumeInformation (for systems that support unsigned drivers).

v7: match dispatch_read behavior (no input buffer), fix missing const,
and remove incorrect FIXME
v6: No change
v5: No change
v4: Split out content from server/device.c and
dlls/ntoskrnl.exe/ntoskrnl.c, fixed copy-paste error identified by
Zeb, and added tests

Best,
Erich

[Zebediah Figura (she/her)]

This introduces a warning:

../wine/server/trace.c: In function ‘dump_irp_params’:
../wine/server/trace.c:343:5: warning: enumeration value 
‘IRP_CALL_VOLUME’ not handled in switch [-Wswitch]
      switch (data->type)
      ^~~~~~