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vmdk: Fix next_cluster_sector for compressed write

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This fixes the bug introduced by commit c6ac36e (vmdk: Optimize cluster
allocation).

Sometimes, write_len could be larger than cluster size, because it
contains both data and marker.  We must advance next_cluster_sector in
this case, otherwise the image gets corrupted.

Cc: qemu-stable@nongnu.org
Reported-by: Antoni Villalonga <qemu-list@friki.cat>
Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Fam Zheng 2015-05-06 20:23:46 +08:00 committed by Kevin Wolf
parent aacd5650c6
commit 5e82a31eb9
1 changed files with 10 additions and 4 deletions
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14
block/vmdk.c
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@ -1302,6 +1302,8 @@ static int vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset,
uLongf buf_len;
const uint8_t *write_buf = buf;
int write_len = nb_sectors * 512;
int64_t write_offset;
int64_t write_end_sector;
if (extent->compressed) {
if (!extent->has_marker) {
@ -1320,10 +1322,14 @@ static int vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset,
write_buf = (uint8_t *)data;
write_len = buf_len + sizeof(VmdkGrainMarker);
}
ret = bdrv_pwrite(extent->file,
cluster_offset + offset_in_cluster,
write_buf,
write_len);
write_offset = cluster_offset + offset_in_cluster,
ret = bdrv_pwrite(extent->file, write_offset, write_buf, write_len);
write_end_sector = DIV_ROUND_UP(write_offset + write_len, BDRV_SECTOR_SIZE);
extent->next_cluster_sector = MAX(extent->next_cluster_sector,
write_end_sector);
if (ret != write_len) {
ret = ret < 0 ? ret : -EIO;
goto out;