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Re: [Bug-tar] Improve sparse file scan through extent_scan module

From: Eric Blake
Subject: Re: [Bug-tar] Improve sparse file scan through extent_scan module
Date: Fri, 19 Aug 2011 07:42:03 -0600
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[adding coreutils and bug-gnulib]

On 08/18/2011 07:33 AM, Jeff liu wrote:
Dear developer,

As the fiemap exent-scan module has been added to coreutils for about half 
year, and looks it works stable in the past few releases.

Is it possible to make use of it to improve the current tar sparse file scan 

We need to migrate the scanner out of coreutils and into gnulib, at which point tar can use it. Also, be aware that the latest 3.1 kernel and glibc.git have added support for SEEK_HOLE and SEEK_DATA, and we should prefer those higher-level interfaces over the lower-level extent scanners, where possible.

I'd like to work a patch out if you guys like it.

Sure, but it starts on the gnulib side.

Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library

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