Commit c743849b authored by Stefan Hajnoczi's avatar Stefan Hajnoczi Committed by Kevin Wolf
Browse files

qed: Refuse to create images on block devices

QED relies on the underlying filesystem to extend the file and maintain
its size.  Check that images are not created on a block device.
Signed-off-by: default avatarStefan Hajnoczi <>
Signed-off-by: default avatarKevin Wolf <>
parent e6184690
......@@ -469,6 +469,12 @@ static int qed_create(const char *filename, uint32_t cluster_size,
return ret;
/* File must start empty and grow, check truncate is supported */
ret = bdrv_truncate(bs, 0);
if (ret < 0) {
goto out;
if (backing_file) {
header.features |= QED_F_BACKING_FILE;
header.backing_filename_offset = sizeof(le_header);
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