linux-kernel - [RFC PATCH 1/5] new helper: iov_iter

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Message-Id: <34dc78b262546e9343e0ed872232a97f5eaa5f15.1426502566.git.osandov@osandov.com>
Date:	Mon, 16 Mar 2015 04:33:49 -0700
From:	Omar Sandoval <osandov@...ndov.com>
To:	Alexander Viro <viro@...iv.linux.org.uk>,
	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@...ts.01.org,
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	ocfs2-devel@....oracle.com, reiserfs-devel@...r.kernel.org,
	v9fs-developer@...ts.sourceforge.net, xfs@....sgi.com
Cc:	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>,
	Omar Sandoval <osandov@...ndov.com>
Subject: [RFC PATCH 1/5] new helper: iov_iter_rw()

Get either READ or WRITE out of iter->type.

Signed-off-by: Omar Sandoval <osandov@...ndov.com>
---
 include/linux/uio.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/uio.h b/include/linux/uio.h
index 7188029..87a47b3 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -10,6 +10,7 @@
 #define __LINUX_UIO_H
 
 #include <linux/kernel.h>
+#include <linux/fs.h>
 #include <uapi/linux/uio.h>
 
 struct page;
@@ -111,6 +112,15 @@ static inline bool iter_is_iovec(struct iov_iter *i)
 }
 
 /*
+ * 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;
+}
+
+/*
  * Cap the iov_iter by given limit; note that the second argument is
  * *not* the new size - it's upper limit for such.  Passing it a value
  * greater than the amount of data in iov_iter is fine - it'll just do
-- 
2.3.3

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