[RFC 7/8] ext4: Enable FMODE_CAN_ATOMIC_WRITE in open for direct-io

[Ritesh Harjani (IBM)]

For inodes which has EXT4_INODE_ATOMIC_WRITE flag set, enable
FMODE_CAN_ATOMIC_WRITE mode in ext4 file open method for file opened
with O_DIRECT.

Co-developed-by: Ojaswin Mujoo <ojaswin@xxxxxxxxxxxxx>
Signed-off-by: Ojaswin Mujoo <ojaswin@xxxxxxxxxxxxx>
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@xxxxxxxxx>
---
 fs/ext4/file.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 8e309a9a0bd6..800fd79e2738 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -913,6 +913,10 @@ static int ext4_file_open(struct inode *inode, struct file *filp)
 			return ret;
 	}
 
+	if (ext4_test_inode_flag(inode, EXT4_INODE_ATOMIC_WRITE) &&
+			(filp->f_flags & O_DIRECT))
+		filp->f_mode |= FMODE_CAN_ATOMIC_WRITE;
+
 	filp->f_mode |= FMODE_NOWAIT | FMODE_BUF_RASYNC |
 			FMODE_DIO_PARALLEL_WRITE;
 	return dquot_file_open(inode, filp);
-- 
2.43.0