Date: Tue, 1 Aug 2006 14:36:38 +0100 From: David Taylor <davidt@yadt.co.uk> To: freebsd-hackers@freebsd.org Subject: Re: [PATCH] adding two new options to 'cp' Message-ID: <20060801133638.GA83496@outcold.yadt.co.uk> In-Reply-To: <ean95a$e1u$1@sea.gmane.org> References: <44C8FB65.9020102@FreeBSD.org> <44CE03D2.2050803@centtech.com> <17614.4005.407223.621637@bhuda.mired.org> <44CE199C.2020500@centtech.com> <17614.8289.134373.387558@bhuda.mired.org> <96b30c400607310847s1d2f845eo212b234d03f51e9a@mail.gmail.com> <17614.10982.499561.139268@bhuda.mired.org> <ealpn1$lan$1@sea.gmane.org> <20060801072611.GA717@turion.vk2pj.dyndns.org> <ean95a$e1u$1@sea.gmane.org>
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On Tue, 01 Aug 2006, Ivan Voras wrote: > Peter Jeremy wrote: >=20 > >Note that it isn's possible to accurately distinguish between a block > >of NULs and a hole in the file through the filesystem. The only way > >to accurately copy a sparse file is with dump/restore. >=20 > Hence the need for an explicit switch. A switch doesn't help. A sparse file can contain both holes and blocks of NULs. You could, I suppose, do something like -s 100, which would seek past any block of >100 NULs. --=20 David Taylor
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