get_devices
rc = get_devices(ctx, sess_arg.session, NULL, &shm_size, func);
rc = get_devices(ctx, sess_arg.session, device_shm, &shm_size, func);
if (sb->s_cop->get_devices) {
devs = sb->s_cop->get_devices(sb, num_devs);
.get_devices = f2fs_get_devices,
struct block_device **(*get_devices)(struct super_block *sb,