From 824614c344ceeb60dd27b38cfdb190471b6a2ef9 Mon Sep 17 00:00:00 2001
From: Fam Zheng <famz@redhat.com>
Date: Mon, 15 Feb 2016 09:28:14 +0100
Subject: [PATCH 01/18] vmdk: Leave bdi intact if -ENOTSUP in vmdk_get_info

RH-Author: Fam Zheng <famz@redhat.com>
Message-id: <1455528511-9357-2-git-send-email-famz@redhat.com>
Patchwork-id: 69167
O-Subject: [RHEL-7.3 qemu-kvm PATCH 01/18] vmdk: Leave bdi intact if -ENOTSUP in vmdk_get_info
Bugzilla: 1299250
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
RH-Acked-by: Max Reitz <mreitz@redhat.com>
RH-Acked-by: Markus Armbruster <armbru@redhat.com>

BZ: https://bugzilla.redhat.com/show_bug.cgi?id=1299250

When extent types don't match, we return -ENOTSUP. In this case, be
polite to the caller and don't modify bdi.

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 1415938161-16217-1-git-send-email-famz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
(cherry picked from commit 5f58330790b72c4705b373ee0646fb3adf800b4e)
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 block/vmdk.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/block/vmdk.c b/block/vmdk.c
index 6b015ab..fa53d2f 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -2137,23 +2137,29 @@ static ImageInfoSpecific *vmdk_get_specific_info(BlockDriverState *bs)
     return spec_info;
 }
 
+static bool vmdk_extents_type_eq(const VmdkExtent *a, const VmdkExtent *b)
+{
+    return a->flat == b->flat &&
+           a->compressed == b->compressed &&
+           (a->flat || a->cluster_sectors == b->cluster_sectors);
+}
+
 static int vmdk_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
 {
     int i;
     BDRVVmdkState *s = bs->opaque;
     assert(s->num_extents);
-    bdi->needs_compressed_writes = s->extents[0].compressed;
-    if (!s->extents[0].flat) {
-        bdi->cluster_size = s->extents[0].cluster_sectors << BDRV_SECTOR_BITS;
-    }
+
     /* See if we have multiple extents but they have different cases */
     for (i = 1; i < s->num_extents; i++) {
-        if (bdi->needs_compressed_writes != s->extents[i].compressed ||
-            (bdi->cluster_size && bdi->cluster_size !=
-                s->extents[i].cluster_sectors << BDRV_SECTOR_BITS)) {
+        if (!vmdk_extents_type_eq(&s->extents[0], &s->extents[i])) {
             return -ENOTSUP;
         }
     }
+    bdi->needs_compressed_writes = s->extents[0].compressed;
+    if (!s->extents[0].flat) {
+        bdi->cluster_size = s->extents[0].cluster_sectors << BDRV_SECTOR_BITS;
+    }
     return 0;
 }
 
-- 
1.8.3.1