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

From: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
To: linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org
Cc: Ojaswin Mujoo <ojaswin@linux.ibm.com>, Jan Kara <jack@suse.cz>,
	Theodore Ts'o <tytso@mit.edu>,
	Matthew Wilcox <willy@infradead.org>,
	"Darrick J . Wong" <djwong@kernel.org>,
	Luis Chamberlain <mcgrof@kernel.org>,
	John Garry <john.g.garry@oracle.com>,
	linux-kernel@vger.kernel.org,
	"Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
Subject: [RFC 7/8] ext4: Enable FMODE_CAN_ATOMIC_WRITE in open for direct-io
Date: Sat,  2 Mar 2024 13:12:04 +0530	[thread overview]
Message-ID: <703c48213ec033af5fd270c5338921db9898774c.1709361537.git.ritesh.list@gmail.com> (raw)
In-Reply-To: <555cc3e262efa77ee5648196362f415a1efc018d.1709361537.git.ritesh.list@gmail.com>

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@linux.ibm.com>
Signed-off-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
---
 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

