Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1423968AbWKAJGy (ORCPT ); Wed, 1 Nov 2006 04:06:54 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1423967AbWKAJGx (ORCPT ); Wed, 1 Nov 2006 04:06:53 -0500 Received: from mailhub.sw.ru ([195.214.233.200]:29777 "EHLO relay.sw.ru") by vger.kernel.org with ESMTP id S1423968AbWKAJGw (ORCPT ); Wed, 1 Nov 2006 04:06:52 -0500 Message-ID: <4548639C.7070608@sw.ru> Date: Wed, 01 Nov 2006 12:06:36 +0300 From: Vasily Averin User-Agent: Thunderbird 1.5.0.7 (X11/20060911) MIME-Version: 1.0 To: akpm@osdl.org CC: viro@zeniv.linux.org.uk, devel@openvz.org, Linux Kernel Mailing List Subject: what lock protects sb->s_flags References: <200610310700.k9V70Oti020243@shell0.pdx.osdl.net> In-Reply-To: <200610310700.k9V70Oti020243@shell0.pdx.osdl.net> X-Enigmail-Version: 0.94.1.0 Content-Type: text/plain; charset=KOI8-R Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 843 Lines: 22 akpm@osdl.org wrote: > Subject: VFS: BKL is not required for remount_fs() > > According to Documentation/filesystems/Locking remount_fs() does not > require BKL. > > (akpm: what lock _does_ protect sb->s_flags?) In general s_flags is changed under sb->s_umount (write) semaphore inside various get_sb(), fill_super() and remount_fs() filesystem functions. Exceptions are: 1) do_emergency_remount -- where s_umount(read) is taken, 2) various filesystem error-handlers (like ext3_abort() and reiserfs_abort()), when filesystem "remounted" to read-only without any locks. Thank you, Vasily Averin - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/