linux-kernel - [PATCH 6/7] f2fs: issue cache flush on direct IO

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Date:	Mon, 25 Apr 2016 17:06:59 -0700
From:	Jaegeuk Kim <jaegeuk@...nel.org>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Cc:	Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH 6/7] f2fs: issue cache flush on direct IO

Under direct IO path with O_(D)SYNC, it needs to set proper APPEND or UPDATE
flags, so taht f2fs_sync_file can make its data safe.

Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/f2fs/data.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index e54489b..38ce5d6 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -673,6 +673,9 @@ next_block:
 					err = reserve_new_block(&dn);
 			} else {
 				err = __allocate_data_block(&dn);
+				if (!err)
+					set_inode_flag(F2FS_I(inode),
+							FI_APPEND_WRITE);
 			}
 			if (err)
 				goto sync_out;
@@ -1685,8 +1688,12 @@ static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
 	trace_f2fs_direct_IO_enter(inode, offset, count, iov_iter_rw(iter));
 
 	err = blockdev_direct_IO(iocb, inode, iter, offset, get_data_block_dio);
-	if (err < 0 && iov_iter_rw(iter) == WRITE)
-		f2fs_write_failed(mapping, offset + count);
+	if (iov_iter_rw(iter) == WRITE) {
+		if (err > 0)
+			set_inode_flag(F2FS_I(inode), FI_UPDATE_WRITE);
+		else if (err < 0)
+			f2fs_write_failed(mapping, offset + count);
+	}
 
 	trace_f2fs_direct_IO_exit(inode, offset, count, iov_iter_rw(iter), err);
 
-- 
2.6.3