[libvirt] [PATCH] storage_backend_fs.c: do not ignore probe failure

[Jim Meyering]

When virStorageBackendProbeTarget fails, it returns -1 or -2.
The two uses below obviously intended to handle those cases
differently, but due to a wrong comparison, they always treated a
"real" (e.g., open) failure (-1) just like an ignorable "wrong file type"
failure (-2).

FYI, coverity reported that the "goto cleanup" statement was
unreachable, which was true in each case, but hardly the real problem.

>From c9ba79daf124afbab351741192bbaf7110a199dd Mon Sep 17 00:00:00 2001
From: Jim Meyering <meyering at redhat.com>
Date: Mon, 18 Jan 2010 10:34:53 +0100
Subject: [PATCH] storage_backend_fs.c: do not ignore probe failure

* src/storage/storage_backend_fs.c (virStorageBackendFileSystemRefresh):
Correct two error-handling bugs.  The documented intent is to ignore
non-regular files, yet due to a comparison "< 0" (rather than "!= 0")
all errors were handled that way.

(vboxStorageVolDelete): Likewise.
(vboxDomainDefineXML): Likewise.
---
 src/storage/storage_backend_fs.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/storage/storage_backend_fs.c b/src/storage/storage_backend_fs.c
index 4fe40b3..fa72f9c 100644
--- a/src/storage/storage_backend_fs.c
+++ b/src/storage/storage_backend_fs.c
@@ -1,7 +1,7 @@
 /*
  * storage_backend_fs.c: storage backend for FS and directory handling
  *
- * Copyright (C) 2007-2009 Red Hat, Inc.
+ * Copyright (C) 2007-2010 Red Hat, Inc.
  * Copyright (C) 2007-2008 Daniel P. Berrange
  *
  * This library is free software; you can redistribute it and/or
@@ -562,7 +562,7 @@ virStorageBackendFileSystemRefresh(virConnectPtr conn,
                                                 &backingStore,
                                                 &vol->allocation,
                                                 &vol->capacity,
-                                                &vol->target.encryption) < 0)) {
+                                                &vol->target.encryption) != 0)) {
             if (ret == -1)
                 goto cleanup;
             else {
@@ -603,7 +603,7 @@ virStorageBackendFileSystemRefresh(virConnectPtr conn,
                 if ((ret = virStorageBackendProbeTarget(conn,
                                                         &vol->backingStore,
                                                         NULL, NULL, NULL,
-                                                        NULL)) < 0) {
+                                                        NULL)) != 0) {
                     if (ret == -1)
                         goto cleanup;
                     else {
--
1.6.6.638.g2bc54