linux-kernel - [PATCH] f2fs: fix to return -EOPNOTSUPP for uncached write

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Message-ID: <20250802023733.1890349-1-chao@kernel.org>
Date: Sat,  2 Aug 2025 10:37:33 +0800
From: Chao Yu <chao@...nel.org>
To: jaegeuk@...nel.org
Cc: linux-f2fs-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	Qi Han <hanqi@...o.com>,
	Jens Axboe <axboe@...nel.dk>,
	Chao Yu <chao@...nel.org>
Subject: [PATCH] f2fs: fix to return -EOPNOTSUPP for uncached write

From: Qi Han <hanqi@...o.com>

f2fs doesn't support uncached write yet, for write() w/ IOCB_DONTCACHE
flag, let's return -EOPNOTSUPP instead of ignoring IOCB_DONTCACHE flag
and write w/o uncached IO.

Cc: Jens Axboe <axboe@...nel.dk>
Cc: Qi Han <hanqi@...o.com>
Signed-off-by: Chao Yu <chao@...nel.org>
---
 fs/f2fs/file.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 9b8d24097b7a..7f09cad6b6d7 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -5185,6 +5185,11 @@ static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 		goto out;
 	}
 
+	if (iocb->ki_flags & IOCB_DONTCACHE) {
+		ret = -EOPNOTSUPP;
+		goto out;
+	}
+
 	if (!f2fs_is_compress_backend_ready(inode)) {
 		ret = -EOPNOTSUPP;
 		goto out;
-- 
2.49.0