commit b053bb55738f35832f3d6472b12277a75c32a038
author John Snow <jsnow@redhat.com> Mon Oct 29 16:23:16 2018 -0400
committer John Snow <jsnow@redhat.com> Mon Oct 29 16:23:16 2018 -0400
tree b0c2f33c09e8d9d4efa384cc6945ca489b45f1f8
parent 0be37c9e19f541643ef407bdafe0282b667ec23c

block/dirty-bitmaps: prohibit enable/disable on locked/frozen bitmaps

We're not being consistent about this. If it's in use by an operation,
the user should not be able to change the behavior of that bitmap.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id: 20181002230218.13949-5-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>

blockdev.c

diff --git a/blockdev.c b/blockdev.c
index 8970f69..35097b9 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2059,6 +2059,13 @@
         return;
     }
 
+    if (bdrv_dirty_bitmap_user_locked(state->bitmap)) {
+        error_setg(errp,
+                   "Bitmap '%s' is currently in use by another operation"
+                   " and cannot be enabled", action->name);
+        return;
+    }
+
     state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
     bdrv_enable_dirty_bitmap(state->bitmap);
 }
@@ -2093,6 +2100,13 @@
         return;
     }
 
+    if (bdrv_dirty_bitmap_user_locked(state->bitmap)) {
+        error_setg(errp,
+                   "Bitmap '%s' is currently in use by another operation"
+                   " and cannot be disabled", action->name);
+        return;
+    }
+
     state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
     bdrv_disable_dirty_bitmap(state->bitmap);
 }
@@ -2934,10 +2948,10 @@
         return;
     }
 
-    if (bdrv_dirty_bitmap_frozen(bitmap)) {
+    if (bdrv_dirty_bitmap_user_locked(bitmap)) {
         error_setg(errp,
-                   "Bitmap '%s' is currently frozen and cannot be enabled",
-                   name);
+                   "Bitmap '%s' is currently in use by another operation"
+                   " and cannot be enabled", name);
         return;
     }
 
@@ -2955,10 +2969,10 @@
         return;
     }
 
-    if (bdrv_dirty_bitmap_frozen(bitmap)) {
+    if (bdrv_dirty_bitmap_user_locked(bitmap)) {
         error_setg(errp,
-                   "Bitmap '%s' is currently frozen and cannot be disabled",
-                   name);
+                   "Bitmap '%s' is currently in use by another operation"
+                   " and cannot be disabled", name);
         return;
     }