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

[Eric Blake]

[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 
> procedure?

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 http://libvirt.org