linux-kernel - [PATCH AUTOSEL 5.4 17/28] ceph: remove bogus checks and WARN_ONs from ceph_set_page

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Message-Id: <20210710235107.3221840-17-sashal@kernel.org>
Date:   Sat, 10 Jul 2021 19:50:56 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jeff Layton <jlayton@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Ilya Dryomov <idryomov@...il.com>,
        Sasha Levin <sashal@...nel.org>, ceph-devel@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 17/28] ceph: remove bogus checks and WARN_ONs from ceph_set_page_dirty

From: Jeff Layton <jlayton@...nel.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@...radead.org>
Signed-off-by: Jeff Layton <jlayton@...nel.org>
Signed-off-by: Ilya Dryomov <idryomov@...il.com>
Signed-off-by: Sasha Levin <sashal@...nel.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 a02e845eb0fb..34ab7b892b70 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -76,10 +76,6 @@ 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",
@@ -125,11 +121,7 @@ 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