static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags) { BDRVRBDState *s = bs->opaque; char pool[RBD_MAX_POOL_NAME_SIZE]; char snap_buf[RBD_MAX_SNAP_NAME_SIZE]; char conf[RBD_MAX_CONF_SIZE]; char clientname_buf[RBD_MAX_CONF_SIZE]; char *clientname; QemuOpts *opts; Error *local_err = NULL; const char *filename; int r; opts = qemu_opts_create_nofail(&runtime_opts); qemu_opts_absorb_qdict(opts, options, &local_err); if (error_is_set(&local_err)) { qerror_report_err(local_err); error_free(local_err); qemu_opts_del(opts); return -EINVAL; } filename = qemu_opt_get(opts, "filename"); qemu_opts_del(opts); if (qemu_rbd_parsename(filename, pool, sizeof(pool), snap_buf, sizeof(snap_buf), s->name, sizeof(s->name), conf, sizeof(conf)) < 0) { return -EINVAL; } clientname = qemu_rbd_parse_clientname(conf, clientname_buf); r = rados_create(&s->cluster, clientname); if (r < 0) { error_report("error initializing"); return r; } s->snap = NULL; if (snap_buf[0] != '\0') { s->snap = g_strdup(snap_buf); } /* * Fallback to more conservative semantics if setting cache * options fails. Ignore errors from setting rbd_cache because the * only possible error is that the option does not exist, and * librbd defaults to no caching. If write through caching cannot * be set up, fall back to no caching. */ if (flags & BDRV_O_NOCACHE) { rados_conf_set(s->cluster, "rbd_cache", "false"); } else { rados_conf_set(s->cluster, "rbd_cache", "true"); } if (strstr(conf, "conf=") == NULL) { /* try default location, but ignore failure */ rados_conf_read_file(s->cluster, NULL); } if (conf[0] != '\0') { r = qemu_rbd_set_conf(s->cluster, conf); if (r < 0) { error_report("error setting config options"); goto failed_shutdown; } } r = rados_connect(s->cluster); if (r < 0) { error_report("error connecting"); goto failed_shutdown; } r = rados_ioctx_create(s->cluster, pool, &s->io_ctx); if (r < 0) { error_report("error opening pool %s", pool); goto failed_shutdown; } r = rbd_open(s->io_ctx, s->name, &s->image, s->snap); if (r < 0) { error_report("error reading header from %s", s->name); goto failed_open; } bs->read_only = (s->snap != NULL); s->event_reader_pos = 0; r = qemu_pipe(s->fds); if (r < 0) { error_report("error opening eventfd"); goto failed; } fcntl(s->fds[0], F_SETFL, O_NONBLOCK); fcntl(s->fds[1], F_SETFL, O_NONBLOCK); qemu_aio_set_fd_handler(s->fds[RBD_FD_READ], qemu_rbd_aio_event_reader, NULL, qemu_rbd_aio_flush_cb, s); return 0; failed: rbd_close(s->image); failed_open: rados_ioctx_destroy(s->io_ctx); failed_shutdown: rados_shutdown(s->cluster); g_free(s->snap); return r; }