linux-kernel - [PATCH v2 20/35] ovl: add O

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Message-Id: <20180507083807.28792-21-mszeredi@redhat.com>
Date:   Mon,  7 May 2018 10:37:52 +0200
From:   Miklos Szeredi <mszeredi@...hat.com>
To:     linux-unionfs@...r.kernel.org
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 20/35] ovl: add O_DIRECT support

Signed-off-by: Miklos Szeredi <mszeredi@...hat.com>
---
 fs/overlayfs/file.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
index 2028f6886649..ce871a15e185 100644
--- a/fs/overlayfs/file.c
+++ b/fs/overlayfs/file.c
@@ -110,6 +110,9 @@ static int ovl_open(struct inode *inode, struct file *file)
 	if (IS_ERR(realfile))
 		return PTR_ERR(realfile);
 
+	/* For O_DIRECT dentry_open() checks f_mapping->a_ops->direct_IO */
+	file->f_mapping = realfile->f_mapping;
+
 	file->private_data = realfile;
 
 	return 0;
-- 
2.14.3