9e2e48ff31
Its way more trouble to update this to a newer version of qemu than it is to backport the two additional features we need. Signed-off-by: Brett Mastbergen <bmastbergen@untangle.com>
47 lines
1.7 KiB
Diff
47 lines
1.7 KiB
Diff
From 66922efc83a670178b208dec2f5123ec85fb6ba3 Mon Sep 17 00:00:00 2001
|
|
From: Fam Zheng <famcool@gmail.com>
|
|
Date: Tue, 12 Jul 2011 19:56:29 +0800
|
|
Subject: [PATCH 03/12] VMDK: bugfix, align offset to cluster in
|
|
get_whole_cluster
|
|
|
|
In get_whole_cluster, the offset is not aligned to cluster when reading
|
|
from backing_hd. When the first write to child is not at the cluster
|
|
boundary, wrong address data from parent is copied to child.
|
|
|
|
Signed-off-by: Fam Zheng <famcool@gmail.com>
|
|
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
|
|
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
|
|
---
|
|
block/vmdk.c | 8 +++++---
|
|
1 file changed, 5 insertions(+), 3 deletions(-)
|
|
|
|
--- a/block/vmdk.c
|
|
+++ b/block/vmdk.c
|
|
@@ -514,21 +514,23 @@ static int get_whole_cluster(BlockDriver
|
|
/* 128 sectors * 512 bytes each = grain size 64KB */
|
|
uint8_t whole_grain[extent->cluster_sectors * 512];
|
|
|
|
- // we will be here if it's first write on non-exist grain(cluster).
|
|
- // try to read from parent image, if exist
|
|
+ /* we will be here if it's first write on non-exist grain(cluster).
|
|
+ * try to read from parent image, if exist */
|
|
if (bs->backing_hd) {
|
|
int ret;
|
|
|
|
if (!vmdk_is_cid_valid(bs))
|
|
return -1;
|
|
|
|
+ /* floor offset to cluster */
|
|
+ offset -= offset % (extent->cluster_sectors * 512);
|
|
ret = bdrv_read(bs->backing_hd, offset >> 9, whole_grain,
|
|
extent->cluster_sectors);
|
|
if (ret < 0) {
|
|
return -1;
|
|
}
|
|
|
|
- //Write grain only into the active image
|
|
+ /* Write grain only into the active image */
|
|
ret = bdrv_write(extent->file, cluster_offset, whole_grain,
|
|
extent->cluster_sectors);
|
|
if (ret < 0) {
|