linux-ext4 - Re: [RFC] add FIEMAP ioctl to efficiently map file allocation

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Message-ID: <461F997E.30002@suse.com>
Date:	Fri, 13 Apr 2007 10:53:50 -0400
From:	Jeff Mahoney <jeffm@...e.com>
To:	Anton Altaparmakov <aia21@....ac.uk>, linux-ext4@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, xfs@....sgi.com, hch@...radead.org
Subject: Re: [RFC] add FIEMAP ioctl to efficiently map file allocation

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Andreas Dilger wrote:
> On Apr 12, 2007  12:22 +0100, Anton Altaparmakov wrote:
>> This would say that the offset on disk can move at any time or that  
>> the data is compressed or encrypted on disk thus the data is not  
>> useful for direct disk access.
> 
> This makes sense.  Even for Reiserfs the same is true with packed tails,
> and I believe if FIBMAP is called on a tail it will migrate the tail into
> a block because this is might be a sign that the file is a kernel that
> LILO wants to boot.

Actually, reiserfs_aop_bmap() returns 0 when the requested block is in a
tail. There's a separate ioctl for unpacking them.

- -Jeff

- --
Jeff Mahoney
SUSE Labs
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