stop using ioends for direct write completions

[Darrick J. Wong]

On Thu, Jan 28, 2016 at 05:16:56AM -0800, Christoph Hellwig wrote:
> Any chance to get a review for this?  It should really help
> with sorting out the buffered I/O COW code.

It looks reasonable to me.  I separated the dio and buffered CoW remap paths a
couple of weeks ago, because it seems that IO errors only get passed back as a
return value from __blockdev_direct_IO, therefore the remapping has to be done
from xfs_vm_do_dio anyway because we don't want to remap if the write fails.
Just yesterday I removed the "is_cow" flag from the ioend, so now we're back to
having a separate XFS_IO_COW ioend type.

So... reflink doesn't need the patch but OTOH directio doesn't really need 
the overhead of allocating an ioend anyway. :)

--D

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