+ return ret;
+}
+
+static noinline int btrfs_ioctl_snap_create(struct file *file,
+ void __user *arg, int subvol,
+ int async)
+{
+ struct btrfs_ioctl_vol_args *vol_args = NULL;
+ struct btrfs_ioctl_async_vol_args *async_vol_args = NULL;
+ char *name;
+ u64 fd;
+ u64 transid = 0;
+ int ret;
+
+ if (async) {
+ async_vol_args = memdup_user(arg, sizeof(*async_vol_args));
+ if (IS_ERR(async_vol_args))
+ return PTR_ERR(async_vol_args);
+
+ name = async_vol_args->name;
+ fd = async_vol_args->fd;
+ async_vol_args->name[BTRFS_SNAPSHOT_NAME_MAX] = '\0';
+ } else {
+ vol_args = memdup_user(arg, sizeof(*vol_args));
+ if (IS_ERR(vol_args))
+ return PTR_ERR(vol_args);
+ name = vol_args->name;
+ fd = vol_args->fd;
+ vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
+ }
+
+ ret = btrfs_ioctl_snap_create_transid(file, name, fd,
+ subvol, &transid);
+
+ if (!ret && async) {
+ if (copy_to_user(arg +
+ offsetof(struct btrfs_ioctl_async_vol_args,
+ transid), &transid, sizeof(transid)))
+ return -EFAULT;
+ }
+