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authorMax Reitz <mreitz@redhat.com>2013-10-20 20:28:20 +0200
committerKevin Wolf <kwolf@redhat.com>2013-10-24 11:45:06 +0200
commiteedff66f21e542650d895801549ce05ac108278b (patch)
tree1462ef8058954cd040fe8d16218da99445a66af9 /block
parentcc94712b9ec93d1301eea1fb8f1b08589c7e242e (diff)
qcow2: Restore total_sectors value in save_vmstate
Since df2a6f29a5, bdrv_co_do_writev increases the total_sectors value of a growable block devices on writes after the current end. This leads to the virtual disk apparently growing in qcow2_save_vmstate, which in turn affects the disk size captured by the internal snapshot taken directly afterwards through e.g. the HMP savevm command. Such a "grown" snapshot cannot be loaded after reopening the qcow2 image, since its disk size differs from the actual virtual disk size (writing a VM state does not actually increase the virtual disk size). Fix this by restoring total_sectors at the end of qcow2_save_vmstate. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block')
-rw-r--r--block/qcow2.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/block/qcow2.c b/block/qcow2.c
index c1abaffa19..4a3e8b45f8 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1939,6 +1939,7 @@ static int qcow2_save_vmstate(BlockDriverState *bs, QEMUIOVector *qiov,
int64_t pos)
{
BDRVQcowState *s = bs->opaque;
+ int64_t total_sectors = bs->total_sectors;
int growable = bs->growable;
int ret;
@@ -1947,6 +1948,11 @@ static int qcow2_save_vmstate(BlockDriverState *bs, QEMUIOVector *qiov,
ret = bdrv_pwritev(bs, qcow2_vm_state_offset(s) + pos, qiov);
bs->growable = growable;
+ /* bdrv_co_do_writev will have increased the total_sectors value to include
+ * the VM state - the VM state is however not an actual part of the block
+ * device, therefore, we need to restore the old value. */
+ bs->total_sectors = total_sectors;
+
return ret;
}