linux-ext4 - Re: Emergency remount readonly and EFBIG errors when unlinking files on 3.18 android kernel

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Message-ID: <20160427032517.GK18496@dastard>
Date:	Wed, 27 Apr 2016 13:25:17 +1000
From:	Dave Chinner <david@...morbit.com>
To:	Theodore Ts'o <tytso@....edu>
Cc:	Nikhilesh Reddy <reddyn@...eaurora.org>, linux-ext4@...r.kernel.org
Subject: Re: Emergency remount readonly and EFBIG errors when unlinking files
 on 3.18 android kernel

On Tue, Apr 26, 2016 at 11:07:36PM -0400, Theodore Ts'o wrote:
> On Tue, Apr 26, 2016 at 03:08:27PM -0700, Nikhilesh Reddy wrote:
> > I would appreciate if you could point me in the right direction and any help
> > you can give me.
> 
> Well, what I'd do is create a new ioctl interface which simulates an
> emergency ro on just the one device, and try to create a reliable
> repro.  Eventually we'll want to add some tests for this in xfstests.

That's pretty much XFS_IOC_GOINGDOWN, controlled by xfs_io -c shutdown.
I'd suggest that adding a new flag:

#define XFS_FSOP_GOING_FLAGS_EMERG_REMOUNT 0x4

Would be in line with it's existing usage in xfstests for forcing
different shutdown conditions on filesystems....

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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