linux-ext4 - [RFC 7/8] ext4: Enable FMODE_CAN_ATOMIC

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Date: Sat,  2 Mar 2024 13:12:04 +0530
From: "Ritesh Harjani (IBM)" <ritesh.list@...il.com>
To: linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org
Cc: Ojaswin Mujoo <ojaswin@...ux.ibm.com>,
	Jan Kara <jack@...e.cz>,
	Theodore Ts'o <tytso@....edu>,
	Matthew Wilcox <willy@...radead.org>,
	"Darrick J . Wong" <djwong@...nel.org>,
	Luis Chamberlain <mcgrof@...nel.org>,
	John Garry <john.g.garry@...cle.com>,
	linux-kernel@...r.kernel.org,
	"Ritesh Harjani (IBM)" <ritesh.list@...il.com>
Subject: [RFC 7/8] ext4: Enable FMODE_CAN_ATOMIC_WRITE in open for direct-io

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