From 15552c4ad38b9ec66792b044cf5ae74538c32717 Mon Sep 17 00:00:00 2001 From: Zhi Yong Wu Date: Mon, 7 May 2012 16:51:03 +0800 Subject: qcow2: lock on prealloc preallocate() will be locked. This is required because qcow2_alloc_cluster_link_l2() assumes that it runs under a lock that it can drop while COW is being performed. Signed-off-by: Zhi Yong Wu Signed-off-by: Kevin Wolf --- block/qcow2.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'block/qcow2.c') diff --git a/block/qcow2.c b/block/qcow2.c index 8c60a6f061..ee4678f6ed 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -1192,7 +1192,10 @@ static int qcow2_create2(const char *filename, int64_t total_size, /* And if we're supposed to preallocate metadata, do that now */ if (prealloc) { + BDRVQcowState *s = bs->opaque; + qemu_co_mutex_lock(&s->lock); ret = preallocate(bs); + qemu_co_mutex_unlock(&s->lock); if (ret < 0) { goto out; } -- cgit v1.2.3