linux-kernel - Re: fiemap is broken for sparse file in ext4?

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Message-ID: <4C125A6C.2090805@redhat.com>
Date:	Fri, 11 Jun 2010 10:46:52 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Tao Ma <tao.ma@...cle.com>
CC:	linux-ext4@...r.kernel.org, Theodore Tso <tytso@....edu>,
	linux-kernel@...r.kernel.org
Subject: Re: fiemap is broken for sparse file in ext4?

Tao Ma wrote:

>> What are you using to call fiemap?  Here it seems to be working:
> I just wrote a simple test program by calling ioctl. It is attached.
> btw, you need to call it immediately after dd so that we have a chance
> that ext4 don't have time to allocate extents. ;)

OK I take it back, I do see it.  *cough* too many different filesystems
on this box ... ;)

Yes, it does look like a bug.

-Eric

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