[Qemu-block] [PATCH] gluster: fix .bdrv_reopen_prepare when backing file is a JSON object

[Stefano Garzarella]

When the backing_file is specified as a JSON object, the
qemu_gluster_reopen_prepare() fails with this message:
    invalid URI json:{"server.0.host": ...}

In this case, we should call qemu_gluster_init() using the QDict
'state->options' that contains the parameters already parsed.

Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1542445
Signed-off-by: Stefano Garzarella <address@hidden>
---
 block/gluster.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/block/gluster.c b/block/gluster.c
index 62f8ff2147..26971db1ea 100644
--- a/block/gluster.c
+++ b/block/gluster.c
@@ -931,7 +931,16 @@ static int qemu_gluster_reopen_prepare(BDRVReopenState 
*state,
     gconf->has_debug = true;
     gconf->logfile = g_strdup(s->logfile);
     gconf->has_logfile = true;
-    reop_s->glfs = qemu_gluster_init(gconf, state->bs->filename, NULL, errp);
+    /*
+     * If 'bs->filename' starts with "json:", then 'state->options' will
+     * contain the parameters already parsed.
+     */
+    if (state->bs->filename && !strstart(state->bs->filename, "json:", NULL)) {
+        reop_s->glfs = qemu_gluster_init(gconf, state->bs->filename, NULL,
+                                         errp);
+    } else {
+        reop_s->glfs = qemu_gluster_init(gconf, NULL, state->options, errp);
+    }
     if (reop_s->glfs == NULL) {
         ret = -errno;
         goto exit;
-- 
2.20.1