[PATCH] xfs: Call kiocb_modified() for buffered write

[Xiao Yang <yangx.jy@fujitsu.com>]

kiocb_modified() should be used for sync/async buffered write
because it will return -EAGAIN when IOCB_NOWAIT is set. Unfortunately,
kiocb_modified() is used by the common xfs_file_write_checks()
which is called by all types of write(i.e. buffered/direct/dax write).
This issue makes generic/471 with xfs always get the following error:
--------------------------------------------------------
QA output created by 471
pwrite: Resource temporarily unavailable
wrote 8388608/8388608 bytes at offset 0
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
pwrite: Resource temporarily unavailable
...
--------------------------------------------------------

Fixes: 1aa91d9c9933 ("xfs: Add async buffered write support")
Signed-off-by: Xiao Yang <yangx.jy@fujitsu.com>
---
 fs/xfs/xfs_file.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index e462d39c840e..561fab3a49c7 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -417,6 +417,9 @@ xfs_file_write_checks(
 		spin_unlock(&ip->i_flags_lock);
 
 out:
+	if (IS_DAX(inode) || (iocb->ki_flags & IOCB_DIRECT))
+		return file_modified(file);
+
 	return kiocb_modified(iocb);
 }
 
-- 
2.21.0