> + /*
> + * If we are renaming a just-written file over an existing
> + * file, be pedantic and flush it out if it looks like somebody
> + * is doing a tmpfile dance, and didn't fsync. Best effort;
> + * ignore errors.
> + */
> + if (new_inode) {
> + xfs_inode_t *ip = XFS_I(odentry->d_inode);
> +
> + if (VN_DIRTY(VFS_I(ip)) && ip->i_delayed_blks > 0)
> + filemap_flush(new_inode->i_mapping);
> + }
IFF we want a heuristic it should be a proper filemap_write_and_wait. a
non-blocking start of I/O without waiting for it is snake oil.
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