releases/5.12.19/ceph-remove-bogus-checks-and-warn_ons-from-ceph_set_.patch

From 184ee9ecd62dbd7ba5781c59fee58861b47c901d Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Tue, 4 May 2021 10:08:30 -0400
Subject: ceph: remove bogus checks and WARN_ONs from ceph_set_page_dirty

From: Jeff Layton <jlayton@kernel.org>

[ Upstream commit 22d41cdcd3cfd467a4af074165357fcbea1c37f5 ]

The checks for page->mapping are odd, as set_page_dirty is an
address_space operation, and I don't see where it would be called on a
non-pagecache page.

The warning about the page lock also seems bogus.  The comment over
set_page_dirty() says that it can be called without the page lock in
some rare cases. I don't think we want to warn if that's the case.

Reported-by: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/ceph/addr.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index c000fe338f7e..c54317c10f58 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -78,10 +78,6 @@ static int ceph_set_page_dirty(struct page *page)
 	struct inode *inode;
 	struct ceph_inode_info *ci;
 	struct ceph_snap_context *snapc;
-	int ret;
-
-	if (unlikely(!mapping))
-		return !TestSetPageDirty(page);
 
 	if (PageDirty(page)) {
 		dout("%p set_page_dirty %p idx %lu -- already dirty\n",
@@ -127,11 +123,7 @@ static int ceph_set_page_dirty(struct page *page)
 	page->private = (unsigned long)snapc;
 	SetPagePrivate(page);
 
-	ret = __set_page_dirty_nobuffers(page);
-	WARN_ON(!PageLocked(page));
-	WARN_ON(!page->mapping);
-
-	return ret;
+	return __set_page_dirty_nobuffers(page);
 }
 
 /*
-- 
2.30.2