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qcow2: Allow qcow2 disk images with size zero

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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>
This commit is contained in:
Stefan Weil 2009-10-26 16:11:16 +01:00 • committed by Anthony Liguori
parent b4558d7481
commit d191d12d5f
2 changed files with 13 additions and 9 deletions
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3
block/qcow2-cluster.c
View file

@ -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;
}