Re: [PATCH v5 3/9] iov_iter: Use IOCB/IOMAP_WRITE if available rather than iterator direction

[Al Viro]

On Wed, Jan 11, 2023 at 02:27:58PM +0000, David Howells wrote:
> If a kiocb or iomap_iter is available, then use the IOCB_WRITE flag or the
> IOMAP_WRITE flag to determine whether we're writing rather than the
> iterator direction flag.
> 
> This allows all but three of the users of iov_iter_rw() to be got rid of: a
> consistency check and a warning statement in cifs and one user in the block
> layer that has neither available.
> 
> Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
> cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
> Link: https://lore.kernel.org/r/167305163159.1521586.9460968250704377087.stgit@xxxxxxxxxxxxxxxxxxxxxx/ # v4

Incidentally, I'd suggest iocb_is_write(iocb) - just look at the amount of
places where you end up with clumsy parentheses...