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Message-Id: <5f9e8a7dcdf08bd2dd433f1a42690ab8e67e7915.1418618044.git.osandov@osandov.com>
Date:	Sun, 14 Dec 2014 21:26:57 -0800
From:	Omar Sandoval <osandov@...ndov.com>
To:	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Christoph Hellwig <hch@...radead.org>,
	David Sterba <dsterba@...e.cz>, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org, linux-nfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	Omar Sandoval <osandov@...ndov.com>
Subject: [PATCH 3/8] swap: don't add ITER_BVEC flag to direct_IO rw

The rw argument to direct_IO has some ill-defined semantics. Some
filesystems (e.g., ext4, FAT) decide whether they're doing a write with
rw == WRITE, but others (e.g., XFS) check rw & WRITE. Let's set a good
example in the swap file code and say ITER_BVEC belongs in
iov_iter->flags but not in rw. This caters to the least common
denominator and avoids a sweeping change of every direct_IO
implementation for now.

Signed-off-by: Omar Sandoval <osandov@...ndov.com>
---
 mm/page_io.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/page_io.c b/mm/page_io.c
index 1630ac0..c229f88 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -285,8 +285,7 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc,
 		set_page_writeback(page);
 		unlock_page(page);
 		mutex_lock(&inode->i_mutex);
-		ret = mapping->a_ops->direct_IO(ITER_BVEC | WRITE,
-						&kiocb, &from,
+		ret = mapping->a_ops->direct_IO(WRITE, &kiocb, &from,
 						kiocb.ki_pos);
 		mutex_unlock(&inode->i_mutex);
 		if (ret == PAGE_SIZE) {
-- 
2.1.3

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