From 77e7f69c3b88ae0a7364fa88334a483a247d7200 Mon Sep 17 00:00:00 2001
From: Peter Krempa <pkrempa@redhat.com>
Date: Wed, 5 Jun 2013 09:38:41 +0200
Subject: [PATCH] storage: Provide better error message if metadata pre-alloc
 is unsupported

Instead of a unknown flag error report that metadata pre-allocation is
not supported with the requested volume creation method.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=969982
---
 src/storage/storage_backend.c | 27 ++++++++++++++++++++++++---
 1 file changed, 24 insertions(+), 3 deletions(-)

diff --git a/src/storage/storage_backend.c b/src/storage/storage_backend.c
index ace9caefc8..5a613811dc 100644
--- a/src/storage/storage_backend.c
+++ b/src/storage/storage_backend.c
@@ -254,7 +254,14 @@ virStorageBackendCreateBlockFrom(virConnectPtr conn ATTRIBUTE_UNUSED,
     gid_t gid;
     uid_t uid;
 
-    virCheckFlags(0, -1);
+    virCheckFlags(VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA, -1);
+
+    if (flags & VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                       _("metadata preallocation is not supported for block "
+                         "volumes"));
+        goto cleanup;
+    }
 
     if ((fd = open(vol->target.path, O_RDWR)) < 0) {
         virReportSystemError(errno,
@@ -385,7 +392,14 @@ virStorageBackendCreateRaw(virConnectPtr conn ATTRIBUTE_UNUSED,
     int fd = -1;
     int operation_flags;
 
-    virCheckFlags(0, -1);
+    virCheckFlags(VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA, -1);
+
+    if (flags & VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                       _("metadata preallocation is not supported for raw "
+                         "volumes"));
+        goto cleanup;
+    }
 
     if (vol->target.encryption != NULL) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
@@ -897,7 +911,14 @@ virStorageBackendCreateQcowCreate(virConnectPtr conn ATTRIBUTE_UNUSED,
     char *size;
     virCommandPtr cmd;
 
-    virCheckFlags(0, -1);
+    virCheckFlags(VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA, -1);
+
+    if (flags & VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                       _("metadata preallocation is not supported with "
+                         "qcow-create"));
+        return -1;
+    }
 
     if (inputvol) {
         virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-- 
2.47.2