[PATCH 06/14] fs: remove the call_{read,write}_iter functions

[Al Viro]

On Thu, May 28, 2020 at 07:40:35AM +0200, Christoph Hellwig wrote:
> Just open coding the methods calls is a lot easier to follow.

Not sure about this one, TBH - it's harder to grep that way, since
you get all the initializers for read_iter/write_iter thrown into
the mix.  Sure, you can do something like '\->[ 	]*read_iter\>',
but it's a PITA.