linux-ext4 - [PATCH v5 2/7] ext4: Check if inode uses extents in ext4_inode_can_atomic

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Message-ID: <86bb502c979398a736ab371d8f35f6866a477f6c.1747337952.git.ritesh.list@gmail.com>
Date: Fri, 16 May 2025 01:20:50 +0530
From: "Ritesh Harjani (IBM)" <ritesh.list@...il.com>
To: linux-ext4@...r.kernel.org
Cc: Theodore Ts'o <tytso@....edu>,
	Jan Kara <jack@...e.cz>,
	John Garry <john.g.garry@...cle.com>,
	djwong@...nel.org,
	Ojaswin Mujoo <ojaswin@...ux.ibm.com>,
	linux-fsdevel@...r.kernel.org,
	"Ritesh Harjani (IBM)" <ritesh.list@...il.com>
Subject: [PATCH v5 2/7] ext4: Check if inode uses extents in ext4_inode_can_atomic_write()

EXT4 only supports doing atomic write on inodes which uses extents, so
add a check in ext4_inode_can_atomic_write() which gets called during
open.

Reviewed-by: Ojaswin Mujoo <ojaswin@...ux.ibm.com>
Acked-by: Darrick J. Wong <djwong@...nel.org>
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@...il.com>
---
 fs/ext4/ext4.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 5a20e9cd7184..c0240f6f6491 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -3847,7 +3847,9 @@ static inline int ext4_buffer_uptodate(struct buffer_head *bh)
 static inline bool ext4_inode_can_atomic_write(struct inode *inode)
 {
 
-	return S_ISREG(inode->i_mode) && EXT4_SB(inode->i_sb)->s_awu_min > 0;
+	return S_ISREG(inode->i_mode) &&
+		ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) &&
+		EXT4_SB(inode->i_sb)->s_awu_min > 0;
 }
 
 extern int ext4_block_write_begin(handle_t *handle, struct folio *folio,
-- 
2.49.0