linux-kernel - [PATCH 3.16.y-ckt 001/144] fuse: notify: don't move pages

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Message-Id: <1429630329-21748-2-git-send-email-luis.henriques@canonical.com>
Date:	Tue, 21 Apr 2015 16:29:46 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Miklos Szeredi <mszeredi@...e.cz>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 001/144] fuse: notify: don't move pages

3.16.7-ckt10 -stable review patch.  If anyone has any objections, please let me know.

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

From: Miklos Szeredi <mszeredi@...e.cz>

commit 0d2783626a53d4c922f82d51fa675cb5d13f0d36 upstream.

fuse_try_move_page() is not prepared for replacing pages that have already
been read.

Reported-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Miklos Szeredi <mszeredi@...e.cz>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 fs/fuse/dev.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index ca887314aba9..a221901813a1 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -1721,6 +1721,9 @@ copy_finish:
 static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code,
 		       unsigned int size, struct fuse_copy_state *cs)
 {
+	/* Don't try to move pages (yet) */
+	cs->move_pages = 0;
+
 	switch (code) {
 	case FUSE_NOTIFY_POLL:
 		return fuse_notify_poll(fc, size, cs);
--
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