Date: Tue, 22 Jul 2003 20:11:42 +1000 From: Peter Jeremy <PeterJeremy@optushome.com.au> To: Mark Murray <mark@grondar.org> Cc: freebsd-arch@freebsd.org Subject: Re: Things to remove from /rescue Message-ID: <20030722101142.GB4105@cirb503493.alcatel.com.au> In-Reply-To: <200307210752.h6L7q3Z2046577@grimreaper.grondar.org> References: <3F16DAFA.41E237F8@mindspring.com> <200307210752.h6L7q3Z2046577@grimreaper.grondar.org>
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On Mon, Jul 21, 2003 at 08:52:03AM +0100, Mark Murray wrote:
>Terry Lambert writes:
>> David O'Brien wrote:
>> > - tar, pax (w/{bz,g}zip) can do everything GNU tar can.
>>
>> I agree with everything but this one. Neither of these things can
>> make sparse files.
>
>Incorrect. Both can.
Not accurately. They can detect that a file is sparse by comparing
the st_size and st_blocks fields returned by stat(). They can't
accurately differentiate between a block of NULs and a non-allocated
block in a sparse file. AFAIK, the only utility that can exactly
reproduce a sparse file is dump/restore.
Peter
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