btrfs_wait_for_commit
ret = btrfs_wait_for_commit(fs_info, transid);
btrfs_wait_for_commit(fs_info, t->transid);
return btrfs_wait_for_commit(fs_info, transid);
ret = btrfs_wait_for_commit(root->fs_info, 0);
int btrfs_wait_for_commit(struct btrfs_fs_info *fs_info, u64 transid);