linux-kernel - [PATCH 5.2 116/162] ceph: clear page dirty before invalidate page

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Message-Id: <20190827072742.457519086@linuxfoundation.org>
Date:   Tue, 27 Aug 2019 09:50:44 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Erqi Chen <chenerqi@...il.com>,
        Jeff Layton <jlayton@...nel.org>,
        Ilya Dryomov <idryomov@...il.com>
Subject: [PATCH 5.2 116/162] ceph: clear page dirty before invalidate page

From: Erqi Chen <chenerqi@...il.com>

commit c95f1c5f436badb9bb87e9b30fd573f6b3d59423 upstream.

clear_page_dirty_for_io(page) before mapping->a_ops->invalidatepage().
invalidatepage() clears page's private flag, if dirty flag is not
cleared, the page may cause BUG_ON failure in ceph_set_page_dirty().

Cc: stable@...r.kernel.org
Link: https://tracker.ceph.com/issues/40862
Signed-off-by: Erqi Chen <chenerqi@...il.com>
Reviewed-by: Jeff Layton <jlayton@...nel.org>
Signed-off-by: Ilya Dryomov <idryomov@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/ceph/addr.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -912,8 +912,9 @@ get_more_pages:
 			if (page_offset(page) >= ceph_wbc.i_size) {
 				dout("%p page eof %llu\n",
 				     page, ceph_wbc.i_size);
-				if (ceph_wbc.size_stable ||
-				    page_offset(page) >= i_size_read(inode))
+				if ((ceph_wbc.size_stable ||
+				    page_offset(page) >= i_size_read(inode)) &&
+				    clear_page_dirty_for_io(page))
 					mapping->a_ops->invalidatepage(page,
 								0, PAGE_SIZE);
 				unlock_page(page);