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Thu, 15 Aug 2024 04:27:52 -0700 (PDT) Received: from localhost.localdomain ([119.28.17.178]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-7c6b61c72d8sm822262a12.23.2024.08.15.04.27.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 15 Aug 2024 04:27:52 -0700 (PDT) From: alexjlzheng@gmail.com X-Google-Original-From: alexjlzheng@tencent.com To: tytso@mit.edu, adilger.kernel@dilger.ca Cc: linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, Jinliang Zheng Subject: [PATCH] ext4: disambiguate the return value of ext4_dio_write_end_io() Date: Thu, 15 Aug 2024 19:27:46 +0800 Message-ID: <20240815112746.18570-1-alexjlzheng@tencent.com> X-Mailer: git-send-email 2.41.1 Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Jinliang Zheng The commit 91562895f803 ("ext4: properly sync file size update after O_SYNC direct IO") causes confusion about the meaning of the return value of ext4_dio_write_end_io(). Specifically, when the ext4_handle_inode_extension() operation succeeds, ext4_dio_write_end_io() directly returns count instead of 0. This does not cause a bug in the current kernel, but the semantics of the return value of the ext4_dio_write_end_io() function are wrong, which is likely to introduce bugs in the future code evolution. Signed-off-by: Jinliang Zheng --- fs/ext4/file.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/fs/ext4/file.c b/fs/ext4/file.c index c89e434db6b7..6df5a92cec2b 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -392,8 +392,9 @@ static int ext4_dio_write_end_io(struct kiocb *iocb, ssize_t size, */ if (pos + size <= READ_ONCE(EXT4_I(inode)->i_disksize) && pos + size <= i_size_read(inode)) - return size; - return ext4_handle_inode_extension(inode, pos, size); + return 0; + error = ext4_handle_inode_extension(inode, pos, size); + return error < 0 ? error : 0; } static const struct iomap_dio_ops ext4_dio_write_ops = {