diff options
| -rw-r--r-- | nbd/client.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/nbd/client.c b/nbd/client.c index 798b82f205..8a083c2f42 100644 --- a/nbd/client.c +++ b/nbd/client.c @@ -21,6 +21,7 @@ #include "qapi/error.h" #include "trace.h" #include "nbd-internal.h" +#include "qemu/cutils.h" /* Definitions for opaque data types */ @@ -828,6 +829,8 @@ static int nbd_list_meta_contexts(QIOChannel *ioc, Error **errp) { int ret; + int seen_any = false; + int seen_qemu = false; if (nbd_send_meta_query(ioc, NBD_OPT_LIST_META_CONTEXT, info->name, NULL, errp) < 0) { @@ -839,9 +842,25 @@ static int nbd_list_meta_contexts(QIOChannel *ioc, ret = nbd_receive_one_meta_context(ioc, NBD_OPT_LIST_META_CONTEXT, &context, NULL, errp); + if (ret == 0 && seen_any && !seen_qemu) { + /* + * Work around qemu 3.0 bug: the server forgot to send + * "qemu:" replies to 0 queries. If we saw at least one + * reply (probably base:allocation), but none of them were + * qemu:, then run a more specific query to make sure. + */ + seen_qemu = true; + if (nbd_send_meta_query(ioc, NBD_OPT_LIST_META_CONTEXT, + info->name, "qemu:", errp) < 0) { + return -1; + } + continue; + } if (ret <= 0) { return ret; } + seen_any = true; + seen_qemu |= strstart(context, "qemu:", NULL); info->contexts = g_renew(char *, info->contexts, ++info->n_contexts); info->contexts[info->n_contexts - 1] = context; } |