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Re: Files full of zeros with coreutils-8.11 and xfs (FIEMAP related?)

To: Eric Blake <eblake@xxxxxxxxxx>
Subject: Re: Files full of zeros with coreutils-8.11 and xfs (FIEMAP related?)
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Fri, 15 Apr 2011 13:26:03 -0400
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, Jim Meyering <jim@xxxxxxxxxxxx>, Eric Sandeen <sandeen@xxxxxxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>, xfs-oss <xfs@xxxxxxxxxxx>, coreutils@xxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, Markus Trippelsdorf <markus@xxxxxxxxxxxxxxx>
In-reply-to: <4DA87F43.5040807@xxxxxxxxxx>
References: <20110414120635.GB1678@xxxxxxxxxxxxxx> <20110414140222.GB1679@xxxxxxxxxxxxxx> <4DA70BD3.1070409@xxxxxxxxxxxxxx> <4DA717B2.3020305@xxxxxxxxxxx> <20110414225904.GK21395@dastard> <4DA7836A.5040604@xxxxxxxxxxxxxx> <20110415000940.GL21395@dastard> <87sjtjq4ir.fsf@xxxxxxxxxxxxxxxx> <20110415171629.GA9088@xxxxxxxxxxxxx> <4DA87F43.5040807@xxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Fri, Apr 15, 2011 at 11:24:19AM -0600, Eric Blake wrote:
> Would it be worth borrowing from Solaris' semantics and adding SEEK_HOLE
> and SEEK_DATA to lseek(2), as a higher level (less-detailed, but easier
> to define and easier to use) interface for discovering the regions of a
> file that only contain NUL bytes?

Yes, I've already suggested that both in this thread and on IRC.

For efficient copies it's the only usable interface.

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