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