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Re: Bugs in mkfs.xfs, device mapper, xfs, and /dev/ram

To: Spelic <spelic@xxxxxxxxxxxxx>
Subject: Re: Bugs in mkfs.xfs, device mapper, xfs, and /dev/ram
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Thu, 2 Dec 2010 09:17:37 -0500
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx, linux-lvm@xxxxxxxxxx
In-reply-to: <4CF7A9C4.2040607@xxxxxxxxxxxxx>
References: <4CF7A539.1050206@xxxxxxxxxxxxx> <20101202141134.GA22012@xxxxxxxxxxxxx> <4CF7A9C4.2040607@xxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Thu, Dec 02, 2010 at 03:14:28PM +0100, Spelic wrote:
> On 12/02/2010 03:11 PM, Christoph Hellwig wrote:
> >I'm pretty sure you have CONFIG_DEBUG_BLOCK_EXT_DEVT enabled.  This
> >option must never be enabled, as it causes block devices to be
> >randomly renumered.  Together with the ramdisk driver overloading
> >the BLKFLSBUF ioctl to discard all data it guarantees you to get
> >data loss like yours.
> 
> Nope...
> 
> # CONFIG_DEBUG_BLOCK_EXT_DEVT is not set

Hmm, I suspect dm-linear's dumb forwarding of ioctls has the same
effect.

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