linux-kernel - [PATCH] f2fs: f2fs supports uncached buffered I/O

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Message-Id: <20250715031054.14404-1-hanqi@vivo.com>
Date: Mon, 14 Jul 2025 21:10:54 -0600
From: Qi Han <hanqi@...o.com>
To: jaegeuk@...nel.org,
	chao@...nel.org
Cc: axboe@...nel.dk,
	linux-f2fs-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	Qi Han <hanqi@...o.com>
Subject: [PATCH] f2fs: f2fs supports uncached buffered I/O

Jens has already completed the development of uncached buffered I/O
in git [1], and in f2fs, the feature can be enabled simply by setting
the FOP_DONTCACHE flag in f2fs_file_operations.

[1]
https://lore.kernel.org/all/20241220154831.1086649-10-axboe@kernel.dk/T/#m58520a94b46f543d82db3711453dfc7bb594b2b0

Signed-off-by: Qi Han <hanqi@...o.com>
---
 fs/f2fs/file.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 696131e655ed..d8da1fc2febf 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -5425,5 +5425,5 @@ const struct file_operations f2fs_file_operations = {
 	.splice_read	= f2fs_file_splice_read,
 	.splice_write	= iter_file_splice_write,
 	.fadvise	= f2fs_file_fadvise,
-	.fop_flags	= FOP_BUFFER_RASYNC,
+	.fop_flags	= FOP_BUFFER_RASYNC | FOP_DONTCACHE,
 };
-- 
2.48.1