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Message-ID: <20240919082539.381626-1-alexjlzheng@tencent.com> Date: Thu, 19 Sep 2024 16:25:39 +0800 From: alexjlzheng@...il.com To: tytso@....edu, adilger.kernel@...ger.ca Cc: linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org, Jinliang Zheng <alexjlzheng@...cent.com> Subject: [RESEND PATCH] ext4: disambiguate the return value of ext4_dio_write_end_io() From: Jinliang Zheng <alexjlzheng@...cent.com> 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 <alexjlzheng@...cent.com> --- Changelog: Just RESEND v1: https://lore.kernel.org/linux-ext4/20240815112746.18570-1-alexjlzheng@tencent.com/ --- 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 = { -- 2.41.1
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