From mboxrd@z Thu Jan 1 00:00:00 1970 From: Cyrill Gorcunov Subject: Re: [patch 25/26] mount options: fix udf Date: Fri, 25 Jan 2008 18:57:18 +0300 Message-ID: <20080125155718.GC7233@cvg> References: <20080124193341.166753833@szeredi.hu> <20080124193456.220272889@szeredi.hu> <20080124202034.GC6724@cvg> <20080125152702.GD28856@atrey.karlin.mff.cuni.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: jack@suse.cz, akpm@linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org To: Miklos Szeredi Return-path: Received: from fg-out-1718.google.com ([72.14.220.156]:17371 "EHLO fg-out-1718.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753276AbYAYP5i (ORCPT ); Fri, 25 Jan 2008 10:57:38 -0500 Received: by fg-out-1718.google.com with SMTP id e21so696118fga.17 for ; Fri, 25 Jan 2008 07:57:37 -0800 (PST) Content-Disposition: inline In-Reply-To: Sender: linux-fsdevel-owner@vger.kernel.org List-ID: [Miklos Szeredi - Fri, Jan 25, 2008 at 04:50:15PM +0100] | > > > | + /* is this correct? */ | > > > | + if (sbi->s_anchor[2] != 0) | > > > | + seq_printf(seq, ",anchor=%u", sbi->s_anchor[2]); | > > > | > > > you know, I would prefer to use form UDF_SB_ANCHOR(sb)[2] | > > > in sake of style unification but we should wait for Jan's | > > > decision (i'm not the expert in this area ;) | > > | > > I think UDF_SB_ANCHOR macro was removed by some patch in -mm. | > Yes, it's going to be removed so don't use it. Actually, basing this | > patch on top of -mm is a good idea because there are quite some changes | > in Andrew's queue. | > | > > I'm more interested if the second element of the s_anchor array really | > > does always have the value of the 'anchor=N' mount option. I haven't | > > been able to verify that fully. Do you have some insight into that? | > As Cyrill wrote, it could be zeroed out in case there is no anchor in | > the specified block. So I guess you have to store the passed value | > somewhere else.. | | But in that case, would the value of the anchor= option matter? | | This is actually a somewhat philosophical question about what the | mount options in /proc/mounts mean: | | 1) Options _given_ by the user for the mount | 2) Options which are _effective_ for the mount | | If we take interpretation 2) and there was no anchor (whatever that | means), then the anchor=N option wasn't effective, and not giving it | would have had the same effect. | | This could be confusing to the user, though... | | Thanks, | Miklos | I think _effective_ options is much more important - they could show you that something bad happened (and if this zeroing of anchor has been happened udf print debug message) Anyway, Miklos, I think the options _given_ by a user does not mean anything in that case because it just doesn't reveal what is being used in _real_. - Cyrill -