linux-ext4 - Re: info about filesystem errors in /sys/fs/ext4/... ?

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Date:	Mon, 05 May 2014 09:53:25 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	"Theodore Ts'o" <tytso@....edu>,
	Lukáš Czerner <lczerner@...hat.com>
CC:	Nikola Ciprich <nikola.ciprich@...uxbox.cz>,
	linux-ext4@...r.kernel.org
Subject: Re: info about filesystem errors in /sys/fs/ext4/... ?

On 5/5/14, 6:59 AM, Theodore Ts'o wrote:
> On Mon, May 05, 2014 at 01:03:17PM +0200, Lukáš Czerner wrote:
>>
>> However we might to go a step further, because I do not
>> really like the idea of allowing to mount the file system with
>> errors by default. It does not really make sense to me and I wonder
>> whether someone actually intend to do it this way.
> 
> We would need to make an exception for the root file system, of
> course.  And I've been receiving patches from folks who want to allow
> e2fsck to be able to fix a mounted, read-only /usr partition, since
> systemd is forcing folks to have to mount /usr read-only before it
> will start, which means /usr needs to be mounted before e2fsck gets
> started by systemd.

I hope these patches make it to the list, if you're considering them.

I don't really know why fsck would need to treat filesystems differently
based on where they are mounted; either we can repair a readonly fs
or not, right?  And if it's done, then the filesystem needs to be immediately
unmounted & remounted[1], or the system rebooted...

-Eric

[1] and I suppose if it can be unmounted & mounted then there was no
good reason to repair it while mounted RO...


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