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Date:	Mon, 16 Mar 2015 17:36:05 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Omar Sandoval <osandov@...ndov.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-btrfs@...r.kernel.org,
	ceph-devel@...r.kernel.org, linux-cifs@...r.kernel.org,
	osd-dev@...n-osd.org, linux-ext4@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net,
	fuse-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
	jfs-discussion@...ts.sourceforge.net, HPDD-discuss@...1.01.org,
	linux-nfs@...r.kernel.org, linux-nilfs@...r.kernel.org,
	ocfs2-devel@....oracle.com, reiserfs-devel@...r.kernel.org,
	v9fs-developer@...ts.sourceforge.net, xfs@....sgi.com,
	linux-kernel@...r.kernel.org, Chris Mason <clm@...com>,
	Josef Bacik <jbacik@...com>, David Sterba <dsterba@...e.cz>,
	Yan Zheng <zyan@...hat.com>, Sage Weil <sage@...hat.com>,
	Steve French <sfrench@...ba.org>,
	Boaz Harrosh <ooo@...ctrozaur.com>,
	Benny Halevy <bhalevy@...marydata.com>,
	Jan Kara <jack@...e.cz>, Theodore Ts'o <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	Jaegeuk Kim <jaegeuk@...nel.org>,
	Changman Lee <cm224.lee@...sung.com>,
	Miklos Szeredi <miklos@...redi.hu>,
	Steven Whitehouse <swhiteho@...hat.com>,
	Dave Kleikamp <shaggy@...nel.org>,
	Oleg Drokin <oleg.drokin@...el.com>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Anna Schumaker <anna.schumaker@...app.com>,
	Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>,
	Mark Fasheh <mfasheh@...e.com>,
	Joel Becker <jlbec@...lplan.org>,
	Eric Van Hensbergen <ericvh@...il.com>,
	Ron Minnich <rminnich@...dia.gov>,
	Latchesar Ionkov <lucho@...kov.net>,
	Dave Chinner <david@...morbit.com>
Subject: Re: [RFC PATCH 1/5] new helper: iov_iter_rw()

On Mon, Mar 16, 2015 at 04:33:49AM -0700, Omar Sandoval wrote:
> Get either READ or WRITE out of iter->type.

Umm...  

> + * Get one of READ or WRITE out of iter->type without any other flags OR'd in
> + * with it.
> + */
> +static inline int iov_iter_rw(const struct iov_iter *i)
> +{
> +	return i->type & RW_MASK;
> +}

TBH, I would turn that into a macro.  Reason: indirect includes.

How about

#define iov_iter_rw(i) ((0 ? (struct iov_iter *)0 : (i))->type & RW_MASK)

Should do you all the type safety of inline function and avoids the need
to include fs.h in uio.h; _users_ of iov_iter_rw() obviously still need
fs.h, but such places always used to...
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