File Split-out-blockdev-readonly-state-detection-helper.patch of Package targetcli-fb.22020

From 7374ba0e53d8e6af4abbb02bd60f35ed541b94f5 Mon Sep 17 00:00:00 2001
From: David Disseldorp <ddiss@suse.de>
Date: Tue, 10 Apr 2018 16:22:54 +0200
Patch-mainline: never (SUSE-specific)
Subject: Split out blockdev readonly state detection helper

So that it can be reused for RBD backstores.

Note: not accepted upstream, but still needed
here for our rbd stuff. (lduncan@suse.com)

Signed-off-by: David Disseldorp <ddiss@suse.de>
---
 targetcli/ui_backstore.py |   40 ++++++++++++++++++++--------------------
 1 file changed, 20 insertions(+), 20 deletions(-)

--- a/targetcli/ui_backstore.py
+++ b/targetcli/ui_backstore.py
@@ -119,6 +119,25 @@ def complete_path(path, stat_fn):
     return sorted(filtered,
                   key=lambda s: '~'+s if s.endswith('/') else s)
 
+def blk_dev_ro_check(dev):
+    BLKROGET=0x0000125E
+    try:
+        f = os.open(dev, os.O_RDONLY)
+    except (OSError, IOError):
+        raise ExecutionError("Could not open %s" % dev)
+    # ioctl returns an int. Provision a buffer for it
+    buf = array.array('b', [0] * 4)
+    try:
+        fcntl.ioctl(f, BLKROGET, buf)
+    except (OSError, IOError):
+        os.close(f)
+        return False
+
+    os.close(f)
+    if struct.unpack('I', buf)[0] == 0:
+        return False
+    return True
+
 
 class UIALUATargetPortGroup(UIRTSLibNode):
     '''
@@ -536,25 +555,6 @@ class UIBlockBackstore(UIBackstore):
         self.so_cls = UIBlockStorageObject
         UIBackstore.__init__(self, 'block', parent)
 
-    def _ui_block_ro_check(self, dev):
-        BLKROGET=0x0000125E
-        try:
-            f = os.open(dev, os.O_RDONLY)
-        except (OSError, IOError):
-            raise ExecutionError("Could not open %s" % dev)
-        # ioctl returns an int. Provision a buffer for it
-        buf = array.array('b', [0] * 4)
-        try:
-            fcntl.ioctl(f, BLKROGET, buf)
-        except (OSError, IOError):
-            os.close(f)
-            return False
-
-        os.close(f)
-        if struct.unpack('I', buf)[0] == 0:
-            return False
-        return True
-
     def ui_command_create(self, name, dev, readonly=None, wwn=None):
         '''
         Creates an Block Storage object. "dev" is the path to the TYPE_DISK
@@ -565,7 +565,7 @@ class UIBlockBackstore(UIBackstore):
         ro_string = self.ui_eval_param(readonly, 'string', None)
         if ro_string == None:
             # attempt to detect block device readonly state via ioctl
-            readonly = self._ui_block_ro_check(dev)
+            readonly = blk_dev_ro_check(dev)
         else:
             readonly = self.ui_eval_param(readonly, 'bool', False)