Re: [PATCH 23/63] xfs: implement deferred bmbt map/unmap operations

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> +/* Deferred mapping is only for real extents in the data fork. */
> +static bool
> +xfs_bmap_is_update_needed(
> +	int			whichfork,
> +	struct xfs_bmbt_irec	*bmap)
> +{
> +	ASSERT(whichfork == XFS_DATA_FORK);
> +
> +	return  bmap->br_startblock != HOLESTARTBLOCK &&
> +		bmap->br_startblock != DELAYSTARTBLOCK;
> +}

Passing in an argument just to assert on it seems weird.
And except for that a better name might be xfs_bmbt_is_real or similar,
and I bet we'd have other users for it as well.

Otherwise this looks fine to me:

Reviewed-by: Christoph Hellwig <hch@xxxxxx>
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