[PATCH v2 14/14] netfs: Fix DIO write retry for filesystems without a ->prepare_write()

Fix netfs_unbuffered_write() so that it doesn't re-issue a write twice when
the filesystem doesn't have a ->prepare_write().  The bit of code that does
the first issue should just be removed as everything it does is done again
when the loop it's in goes back to the top.

Reported-by: [email protected]
Closes: https://syzkaller.appspot.com/bug?extid=3c74b1f0c372e98efc32
Tested-by: [email protected]
Signed-off-by: David Howells <[email protected]>
cc: Paulo Alcantara <[email protected]>
cc: hongao <[email protected]>
cc: ChenXiaoSong <[email protected]>
cc: [email protected]
cc: [email protected]
---
 fs/netfs/direct_write.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/fs/netfs/direct_write.c b/fs/netfs/direct_write.c
index 25f8ceb15fad..1ff1789016b8 100644
--- a/fs/netfs/direct_write.c
+++ b/fs/netfs/direct_write.c
@@ -190,12 +190,6 @@ static int netfs_unbuffered_write(struct netfs_io_request *wreq)
 			stream->prepare_write(subreq);
 			__set_bit(NETFS_SREQ_IN_PROGRESS, &subreq->flags);
 			netfs_stat(&netfs_n_wh_retry_write_subreq);
-		} else {
-			struct iov_iter source;
-
-			netfs_reset_iter(subreq);
-			source = subreq->io_iter;
-			netfs_reissue_write(stream, subreq, &source);
 		}
 	}