From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Fri, 14 Nov 2008 02:37:22 +0000 (GMT) From: Hugh Dickins Subject: [PATCH 2.6.28?] don't unlink an active swapfile In-Reply-To: <20081018205647.GA29946@1wt.eu> Message-ID: References: <20081018003117.GC26067@cordes.ca> <20081018051800.GO24654@1wt.eu> <20081018204948.GA22140@infradead.org> <20081018205647.GA29946@1wt.eu> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Andrew Morton Cc: Willy Tarreau , Christoph Hellwig , Peter Cordes , Bodo Eggert <7eggert@gmx.de>, David Newall , Peter Zijlstra , linux-kernel@vger.kernel.org, linux-mm List-ID: Peter Cordes is sorry that he rm'ed his swapfiles while they were in use, he then had no pathname to swapoff. It's a curious little oversight, but not one worth a lot of hackery. Kudos to Willy Tarreau for turning this around from a discussion of synthetic pathnames to how to prevent unlink. Mimic immutable: prohibit unlinking an active swapfile in may_delete() (and don't worry my little head over the tiny race window). Signed-off-by: Hugh Dickins --- Perhaps this is too late for 2.6.28: your decision. fs/namei.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- 2.6.28-rc4/fs/namei.c 2008-10-24 09:28:19.000000000 +0100 +++ linux/fs/namei.c 2008-11-12 11:52:44.000000000 +0000 @@ -1378,7 +1378,7 @@ static int may_delete(struct inode *dir, if (IS_APPEND(dir)) return -EPERM; if (check_sticky(dir, victim->d_inode)||IS_APPEND(victim->d_inode)|| - IS_IMMUTABLE(victim->d_inode)) + IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) return -EPERM; if (isdir) { if (!S_ISDIR(victim->d_inode->i_mode)) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org