Deprecate Windows OS support

Unfortunately the Winstackers project has been retired because of no
maintainers[1][2], and OpenStack on Windows host is no longer
maintained.

[1] https://lists.openstack.org/pipermail/openstack-discuss/2022-November/031044.html
[2] https://review.opendev.org/c/openstack/governance/+/886880

Change-Id: Ic9438ac444734c397cbc814cfee82f4f60abfd74

cinder/service.py

@@ -666,6 +666,8 @@ class WindowsProcessLauncher(object):
         self._signal_handler = service.SignalHandler()
         self._add_signal_handlers()
 
+        LOG.warning("Support for Windows operating systems is deprecated.")
+
     def add_process(self, cmd):
         LOG.info("Starting subprocess: %s", cmd)
 

cinder/volume/drivers/windows/iscsi.py

@@ -58,6 +58,8 @@ class WindowsISCSIDriver(driver.ISCSIDriver):
     # ThirdPartySystems wiki page
     CI_WIKI_NAME = "Microsoft_iSCSI_CI"
 
+    SUPPORTED = False
+
     def __init__(self, *args, **kwargs):
         super(WindowsISCSIDriver, self).__init__(*args, **kwargs)
         self.configuration = kwargs.get('configuration', None)

cinder/volume/drivers/windows/smbfs.py

@@ -89,6 +89,8 @@ class WindowsSmbfsDriver(remotefs_drv.RevertToSnapshotMixin,
     # ThirdPartySystems wiki page
     CI_WIKI_NAME = "Cloudbase_Cinder_SMB3_CI"
 
+    SUPPORTED = False
+
     _MINIMUM_QEMU_IMG_VERSION = '1.6'
 
     _SUPPORTED_IMAGE_FORMATS = [_DISK_FORMAT_VHD,

doc/source/reference/support-matrix.ini

@@ -313,8 +313,8 @@ driver.vrtsaccess=missing
 driver.vrtscnfs=missing
 driver.vzstorage=missing
 driver.vmware=complete
-driver.win_iscsi=complete
-driver.win_smb=complete
+driver.win_iscsi=missing
+driver.win_smb=missing
 driver.yadro=complete
 driver.zadara=complete
 

releasenotes/notes/deprecate-windows-support-4667f38d71fa8ad6.yaml

@@ -0,0 +1,21 @@
+---
+upgrade:
+  - |
+    The following drivers have been marked as unsupported and are now
+    deprecated. ``enable_unsupported_driver`` will need to be set to ``True``
+    in the driver's section in cinder.conf to continue to use these drivers.
+
+    - ``Windows iSCSI Driver``
+    - ``Windows SMB Driver``
+
+deprecations:
+  - |
+    Support for running Cinder in Windows operating systems has been deprecated
+    because of retirement of the Winstackers project.
+
+  - |
+    The following drivers have been marked as unsupported and are now
+    deprecated.
+
+    - ``Windows iSCSI Driver``
+    - ``Windows SMB Driver``