Signed-off-by: Jeff Cody <jc...@redhat.com> Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com> Reviewed-by: John Snow <js...@redhat.com> Message-id: 00aed7ffdd7be4b9ed9ce1007d50028a72b34ebe.1491597120.git.jc...@redhat.com --- block.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/block.c b/block.c index 84f12f7..9fca814 100644 --- a/block.c +++ b/block.c @@ -2789,6 +2789,7 @@ int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, BlockDriver *drv; QemuOpts *opts; const char *value; + bool read_only; assert(reopen_state != NULL); assert(reopen_state->bs->drv != NULL); @@ -2817,12 +2818,13 @@ int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, qdict_put(reopen_state->options, "driver", qstring_from_str(value)); } - /* if we are to stay read-only, do not allow permission change - * to r/w */ - if (!(reopen_state->bs->open_flags & BDRV_O_ALLOW_RDWR) && - reopen_state->flags & BDRV_O_RDWR) { - error_setg(errp, "Node '%s' is read only", - bdrv_get_device_or_node_name(reopen_state->bs)); + /* If we are to stay read-only, do not allow permission change + * to r/w. Attempting to set to r/w may fail if either BDRV_O_ALLOW_RDWR is + * not set, or if the BDS still has copy_on_read enabled */ + read_only = !(reopen_state->flags & BDRV_O_RDWR); + ret = bdrv_can_set_read_only(reopen_state->bs, read_only, &local_err); + if (local_err) { + error_propagate(errp, local_err); goto error; } -- 2.9.3