linux-kernel - [PATCH 3.16 122/158] __generic_file_write_iter(): fix handling of sync error after DIO

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Message-Id: <20140915192546.549926074@linuxfoundation.org>
Date:	Mon, 15 Sep 2014 12:26:01 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Anton Altaparmakov <aia21@....ac.uk>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: [PATCH 3.16 122/158] __generic_file_write_iter(): fix handling of sync error after DIO

3.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Al Viro <viro@...iv.linux.org.uk>

commit 60bb45297f7551833346c5cebc6d483ea17ea5f2 upstream.

If DIO results in short write and sync write fails, we want to bugger off
whether the DIO part has written anything or not; the logics on the return
will take care of the right return value.

Reported-by: Anton Altaparmakov <aia21@....ac.uk>
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 mm/filemap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2584,7 +2584,7 @@ ssize_t __generic_file_write_iter(struct
 		 * that this differs from normal direct-io semantics, which
 		 * will return -EFOO even if some bytes were written.
 		 */
-		if (unlikely(status < 0) && !written) {
+		if (unlikely(status < 0)) {
 			err = status;
 			goto out;
 		}


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