linux-ext4 - Re: [PATCH] ext3: skip orphan cleanup on rocompat fs

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Message-ID: <AANLkTinofyYH02WT=mx4m_sD_4FoUxPQD7OJT8UZh5_b@mail.gmail.com>
Date:	Mon, 28 Feb 2011 15:10:25 +0200
From:	Amir Goldstein <amir73il@...il.com>
To:	Rogier Wolff <R.E.Wolff@...wizard.nl>
Cc:	Jan Kara <jack@...e.cz>, Theodore Tso <tytso@....edu>,
	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] ext3: skip orphan cleanup on rocompat fs

On Mon, Feb 28, 2011 at 12:14 PM, Rogier Wolff <R.E.Wolff@...wizard.nl> wrote:
>
> On Sat, Feb 26, 2011 at 10:40:19PM +0200, Amir Goldstein wrote:
>> This patch skips the orphan cleanup if readonly compatible features
>> would prevent the fs from being mounted (or remounted) readwrite.
>
> I use the "mount readonly" option to, for instance, view/check the
> filesystem to determine wether or not I need to fsck first. I use the
> "readonly" feature to prevent the mounting to be a mistake-prone
> situation. It prevents e.g. applications from dropping temporary files
> in my current directory.
>
> Every time fsck or such a cleanup does something, there is the option
> of the cleanup or fixup being wrong. When you honour the "readonly"
> request from the user, the careful user can go back to the situation
> where he/she started.
>
> If the cleanup/fixup is really neccesary, do so in in-core buffers of
> the filesystem. Write the infrastructure that allows us to have dirty
> buffers that MAY NOT (yet?!?) be written to the device. This will also
> solve the problem of journal recovery on readonly mount of a root
> filesystem. when it has been fscked, and it's remounted rw, we can
> remove the ban on the writeback of the dirty buffers.
>
> So I stronly disagree with your patch: It should not only prevent the
> cleanup when writing is not allows due to ro-compat situation, but
> also when requested by the user.
>

I am not disagreeing with your disagreement, but implementing what
you desire has more implications than my patch, so I rather that my
patch gets merged, because it is mostly-harmless and we can continue
the discussion, whether or not file systems need to honor the readonly
mount option to the word in parallel.

Amir.
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