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Date: Sun, 18 Jun 2006 16:14:11 +0100
From: Al Viro <viro@ftp.linux.org.uk>
To: Andr? Goddard Rosa <andre.goddard@gmail.com>
Cc: linux list <linux-kernel@vger.kernel.org>
Subject: Re: Support for SEEK_HOLE and SEEK_DATA for sparse files on lseek(2)
Message-ID: <20060618151411.GV27946@ftp.linux.org.uk>
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On Sun, Jun 18, 2006 at 09:20:43AM -0400, Andr? Goddard Rosa wrote:
> Hi, all!
> 
> Jeff Bonwick, from Slab allocator and ZFS fame is asking for comments on
> supporting SEEK_HOLE and SEEK_DATA for sparse files on lseek(2), like
> stated in this snip:
> 
> "Portability
> At this writing, SEEK_HOLE and SEEK_DATA are Solaris-specific. I
> encourage (implore? beg?) other operating systems to adopt these
> lseek(2) extensions verbatim (100% tax-free) so that sparse file
> navigation becomes a ubiquitous feature that every backup and
> archiving program can rely on. It's long overdue."

Well...  Description makes sense and it isn't hard to implement.
About the only question is about semantics for directories...