block: improve permission conflict error message

Now permissions are updated as follows:
 1. do graph modifications ignoring permissions
 2. do permission update

 (of course, we rollback [1] if [2] fails)

So, on stage [2] we can't say which users are "old" and which are
"new" and exist only since [1]. And current error message is a bit
outdated. Let's improve it, to make everything clean.

While being here, add also a comment and some good assertions.

iotests 283, 307, qsd-jobs outputs are updated.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20210601075218.79249-7-vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 22 insertions, 7 deletions

diff --git a/block.c b/block.c
index 3c0c3964ec..3f456892d0 100644
--- a/block.c
+++ b/block.c
@@ -2029,20 +2029,35 @@ static char *bdrv_child_user_desc(BdrvChild *c)
     return c->klass->get_parent_desc(c);
 }
 
+/*
+ * Check that @a allows everything that @b needs. @a and @b must reference same
+ * child node.
+ */
 static bool bdrv_a_allow_b(BdrvChild *a, BdrvChild *b, Error **errp)
 {
-    g_autofree char *user = NULL;
-    g_autofree char *perm_names = NULL;
+    const char *child_bs_name;
+    g_autofree char *a_user = NULL;
+    g_autofree char *b_user = NULL;
+    g_autofree char *perms = NULL;
+
+    assert(a->bs);
+    assert(a->bs == b->bs);
 
     if ((b->perm & a->shared_perm) == b->perm) {
         return true;
     }
 
-    perm_names = bdrv_perm_names(b->perm & ~a->shared_perm);
-    user = bdrv_child_user_desc(a);
-    error_setg(errp, "Conflicts with use by %s as '%s', which does not "
-               "allow '%s' on %s",
-               user, a->name, perm_names, bdrv_get_node_name(b->bs));
+    child_bs_name = bdrv_get_node_name(b->bs);
+    a_user = bdrv_child_user_desc(a);
+    b_user = bdrv_child_user_desc(b);
+    perms = bdrv_perm_names(b->perm & ~a->shared_perm);
+
+    error_setg(errp, "Permission conflict on node '%s': permissions '%s' are "
+               "both required by %s (uses node '%s' as '%s' child) and "
+               "unshared by %s (uses node '%s' as '%s' child).",
+               child_bs_name, perms,
+               b_user, child_bs_name, b->name,
+               a_user, child_bs_name, a->name);
 
     return false;
 }