linux-kernel - [PATCH 4.10 049/167] mm balloon: umount balloon

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Date:   Fri, 10 Mar 2017 10:08:12 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yisheng Xie <xieyisheng1@...wei.com>,
        Minchan Kim <minchan@...nel.org>,
        Rafael Aquini <aquini@...hat.com>,
        Konstantin Khlebnikov <koct9i@...il.com>,
        Gioh Kim <gi-oh.kim@...fitbricks.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...nel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Hanjun Guo <guohanjun@...wei.com>,
        Xishi Qiu <qiuxishi@...wei.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 4.10 049/167] mm balloon: umount balloon_mnt when removing vb device

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

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

From: Yisheng Xie <xieyisheng1@...wei.com>

commit 9c57b5808c625f4fc93da330b932647eaff321f7 upstream.

With CONFIG_BALLOON_COMPACTION=y the kernel will mount balloon_mnt for
balloon page migration when we probe a virtio_balloon device.  However
we do not unmount it when removing the device.  Fix this.

Fixes: b1123ea6d3b3 ("mm: balloon: use general non-lru movable page feature")
Link: http://lkml.kernel.org/r/1486531318-35189-1-git-send-email-xieyisheng1@huawei.com
Signed-off-by: Yisheng Xie <xieyisheng1@...wei.com>
Acked-by: Minchan Kim <minchan@...nel.org>
Cc: Rafael Aquini <aquini@...hat.com>
Cc: Konstantin Khlebnikov <koct9i@...il.com>
Cc: Gioh Kim <gi-oh.kim@...fitbricks.com>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: Michal Hocko <mhocko@...nel.org>
Cc: Michael S. Tsirkin <mst@...hat.com>
Cc: Jason Wang <jasowang@...hat.com>
Cc: Hanjun Guo <guohanjun@...wei.com>
Cc: Xishi Qiu <qiuxishi@...wei.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/virtio/virtio_balloon.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -615,8 +615,12 @@ static void virtballoon_remove(struct vi
 	cancel_work_sync(&vb->update_balloon_stats_work);

 	remove_common(vb);
+#ifdef CONFIG_BALLOON_COMPACTION
 	if (vb->vb_dev_info.inode)
 		iput(vb->vb_dev_info.inode);
+
+	kern_unmount(balloon_mnt);
+#endif
 	kfree(vb);
 }