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vvfat: Fix qcow write target driver specification 

First, bdrv_open_child() expects all options for the child to be
prefixed by the child's name (and a separating dot). Second,
bdrv_open_child() does not take ownership of the QDict passed to it but
only extracts all options for the child, so if a QDict is created for
the sole purpose of passing it to bdrv_open_child(), it needs to be
freed afterwards.

This patch makes vvfat adhere to both of these rules.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-id: 20160711135452.11304-1-mreitz@redhat.com
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Max Reitz 2016-07-11 15:54:52 +02:00
parent 0c204cc810
commit c4b48bfdc5
1 changed files with 2 additions and 1 deletions
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3
block/vvfat.c
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@ -3018,9 +3018,10 @@ static int enable_write_target(BlockDriverState *bs, Error **errp)
}
options = qdict_new();
qdict_put(options, "driver", qstring_from_str("qcow"));
qdict_put(options, "write-target.driver", qstring_from_str("qcow"));
s->qcow = bdrv_open_child(s->qcow_filename, options, "write-target", bs,
&child_vvfat_qcow, false, errp);
QDECREF(options);
if (!s->qcow) {
ret = -EINVAL;
goto err;