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[coreutils] suggested cmp optimization for sparse files

From: Eric Blake
Subject: [coreutils] suggested cmp optimization for sparse files
Date: Fri, 23 Jul 2010 10:13:30 -0600
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On the coreutils list, there was a recent discussion about using fiemap and/or SEEK_DATA/SEEK_HOLE support in recent OSs to efficiently detect holes in sparse files: 

http://lists.gnu.org/archive/html/bug-coreutils/2010-07/msg00100.html
I think porting cmp to use this would be a nice optimization to make it faster to run cmp on two large but sparse files, since you could efficiently skip runs of 0. 

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Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library http://libvirt.org
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