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authorKevin Wolf <kwolf@redhat.com>2012-03-06 12:44:45 +0100
committerKevin Wolf <kwolf@redhat.com>2012-03-12 15:14:06 +0100
commit259b21731050eccfe1fd4da949a9633ec7547b04 (patch)
tree7f14b464bd250124f89af54f8fdfd99b680688d2 /block
parente88774971c33671477c9eb4a4cf1e65a047c9838 (diff)
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qcow2: Add error messages in qcow2_truncate
qemu-img resize has some limitations with qcow2, but the user is only told that "this image format does not support resize". Quite confusing, so add some more detailed error_report() calls and change "this image format" into "this image". Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Diffstat (limited to 'block')
-rw-r--r--block/qcow2.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/block/qcow2.c b/block/qcow2.c
index 6f53ec6..7aece65 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1120,16 +1120,19 @@ static int qcow2_truncate(BlockDriverState *bs, int64_t offset)
int ret, new_l1_size;
if (offset & 511) {
+ error_report("The new size must be a multiple of 512");
return -EINVAL;
}
/* cannot proceed if image has snapshots */
if (s->nb_snapshots) {
+ error_report("Can't resize an image which has snapshots");
return -ENOTSUP;
}
/* shrinking is currently not supported */
if (offset < bs->total_sectors * 512) {
+ error_report("qcow2 doesn't support shrinking images yet");
return -ENOTSUP;
}