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From 47886bf3b19f06d0a5255d9656d1c02800baddd0 Mon Sep 17 00:00:00 2001
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From: Fam Zheng <famz@redhat.com>
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Date: Mon, 15 Feb 2016 09:28:25 +0100
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Subject: [PATCH 12/18] vmdk: Fix next_cluster_sector for compressed write
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RH-Author: Fam Zheng <famz@redhat.com>
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Message-id: <1455528511-9357-13-git-send-email-famz@redhat.com>
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Patchwork-id: 69178
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O-Subject: [RHEL-7.3 qemu-kvm PATCH 12/18] vmdk: Fix next_cluster_sector for compressed write
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Bugzilla: 1299250
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: Markus Armbruster <armbru@redhat.com>
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BZ: https://bugzilla.redhat.com/show_bug.cgi?id=1299250
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This fixes the bug introduced by commit c6ac36e (vmdk: Optimize cluster
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allocation).
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Sometimes, write_len could be larger than cluster size, because it
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contains both data and marker. We must advance next_cluster_sector in
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this case, otherwise the image gets corrupted.
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Cc: qemu-stable@nongnu.org
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Reported-by: Antoni Villalonga <qemu-list@friki.cat>
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Reviewed-by: Max Reitz <mreitz@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit 5e82a31eb967db135fc4e688b134fb0972d62de3)
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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block/vmdk.c | 14 ++++++++++----
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1 file changed, 10 insertions(+), 4 deletions(-)
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diff --git a/block/vmdk.c b/block/vmdk.c
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index 3810d75..dd8b638 100644
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--- a/block/vmdk.c
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+++ b/block/vmdk.c
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@@ -1297,6 +1297,8 @@ static int vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset,
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uLongf buf_len;
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const uint8_t *write_buf = buf;
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int write_len = nb_sectors * 512;
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+ int64_t write_offset;
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+ int64_t write_end_sector;
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if (extent->compressed) {
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if (!extent->has_marker) {
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@@ -1315,10 +1317,14 @@ static int vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset,
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write_buf = (uint8_t *)data;
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write_len = buf_len + sizeof(VmdkGrainMarker);
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}
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- ret = bdrv_pwrite(extent->file,
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- cluster_offset + offset_in_cluster,
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- write_buf,
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- write_len);
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+ write_offset = cluster_offset + offset_in_cluster,
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+ ret = bdrv_pwrite(extent->file, write_offset, write_buf, write_len);
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+
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+ write_end_sector = DIV_ROUND_UP(write_offset + write_len, BDRV_SECTOR_SIZE);
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+
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+ extent->next_cluster_sector = MAX(extent->next_cluster_sector,
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+ write_end_sector);
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+
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if (ret != write_len) {
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ret = ret < 0 ? ret : -EIO;
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goto out;
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--
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1.8.3.1
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