diff options
| author | Stefan Weil <weil@mail.berlios.de> | 2009-10-26 16:11:16 +0100 |
|---|---|---|
| committer | Anthony Liguori <aliguori@us.ibm.com> | 2009-11-09 08:43:01 -0600 |
| commit | d191d12d5f479422e16ed1d12b0222547b29036a (patch) | |
| tree | dafeb368cfc86e2a8b7d69100a5d167fc363febd /block/qcow2-cluster.c | |
| parent | b4558d7481aefc865b0b52bf9b285ebcf2e8b59f (diff) | |
qcow2: Allow qcow2 disk images with size zero
Images with disk size 0 may be used for
VM snapshots, but not to save normal block data.
It is possible to create such images using
qemu-img, but opening them later fails.
So even "qemu-img info image.qcow2" is not
possible for an image created with
"qemu-img create -f qcow2 image.qcow2 0".
This is fixed here.
Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'block/qcow2-cluster.c')
| -rw-r--r-- | block/qcow2-cluster.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index e444e53e13..f88118cdc5 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -39,6 +39,9 @@ int qcow2_grow_l1_table(BlockDriverState *bs, int min_size) new_l1_size = s->l1_size; if (min_size <= new_l1_size) return 0; + if (new_l1_size == 0) { + new_l1_size = 1; + } while (min_size > new_l1_size) { new_l1_size = (new_l1_size * 3 + 1) / 2; } |