[PATCH 04/14] xfs: reorder zeroing and flushing sequence in truncate

[Bob Peterson]

----- Original Message -----
> Currently zeroing out blocks and waiting for writeout is a bit of a mess in
> truncate.  This patch gives it a clear order in preparation for the iomap
> path:
> 
>  (1) we first wait for any direct I/O to complete to prevent any races
>      for it
>  (2) we then perform the actual zeroing, and only use the truncate_page
>      helpers for truncating down.  The truncate up case already is
>      handled by the separate call to xfs_zero_eof.
>  (3) only then we write back dirty data, as zeroing block may cause
>      dirty pages when using either xfs_zero_eof or the new iomap
>      infrastructure.
> 
> Signed-off-by: Christoph Hellwig <hch at lst.de>
> ---
> +	 * Start with zeroing any data beyond EOF that we may expose on file
> +	 & extension, or zeroing out the rest of the block on a downward

This "&" should be "*".

Reviewed-by: Bob Peterson <rpeterso at redhat.com>