linux-hardening - [PATCH 02/19] fs: make ->kill

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Message-Id: <20230913111013.77623-3-hch@lst.de>
Date:   Wed, 13 Sep 2023 08:09:56 -0300
From:   Christoph Hellwig <hch@....de>
To:     Christian Brauner <brauner@...nel.org>,
        Al Viro <viro@...iv.linux.org.uk>
Cc:     Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>,
        Tejun Heo <tj@...nel.org>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Damien Le Moal <dlemoal@...nel.org>,
        Naohiro Aota <naohiro.aota@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-nfs@...r.kernel.org, linux-hardening@...r.kernel.org,
        cgroups@...r.kernel.org
Subject: [PATCH 02/19] fs: make ->kill_sb optional

Call generic_shutdown_super if ->kill_sb is not provided by the file
system.  This can't currently happen but will become common soon.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 fs/super.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/super.c b/fs/super.c
index 127a17d958a482..ab234e6af48605 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -483,7 +483,11 @@ void deactivate_locked_super(struct super_block *s)
 	}
 
 	unregister_shrinker(&s->s_shrink);
-	fs->kill_sb(s);
+
+	if (fs->kill_sb)
+		fs->kill_sb(s);
+	else
+		generic_shutdown_super(s);
 
 	kill_super_notify(s);
 
-- 
2.39.2