Date: Sat, 12 Feb 2011 21:42:33 -0800 From: Julian Elischer <julian@freebsd.org> To: perryh@pluto.rain.com Cc: jhs@berklix.com, hackers@freebsd.org Subject: Re: memstick.img is bloated with 7% 2K blocks of nulls Message-ID: <4D576F49.5030201@freebsd.org> In-Reply-To: <4d5753d7.BT5wqP8CnfTD02s8%perryh@pluto.rain.com> References: <201102111909.p1BJ9UAE097045@fire.js.berklix.net> <66758C9D-DCE2-4381-A4B1-956A48423CDD@kientzle.com> <4d5753d7.BT5wqP8CnfTD02s8%perryh@pluto.rain.com>
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On 2/12/11 7:45 PM, perryh@pluto.rain.com wrote: > Tim Kientzle<tim@kientzle.com> wrote: > >> The strategy used by libarchive's recent ISO writer >> is to concatenate the file bodies into a temp file >> (with minimal padding between entries to meet alignment >> requirements) while storing directory information >> in memory. The final output then consists of the >> directory information followed by the concatenated >> file bodies. >> >> I suspect a similar strategy could be used to lay >> out and write a read-only optimized UFS image ... >> I think it's probably feasible but I doubt very >> much of the existing UFS code can be recycled for >> such a project. > There was at one time a capability in mkfs(8) -- which no > longer even exists as a separate entity, having been absorbed > into newfs(8) -- to pre-populate the filesystem with specified > content. Dunno if it was ever in any BSD release -- it's not > mentioned in the 4.2BSD-derived SunOS 4.1.1 manpage -- so > I may be remembering it from Bell Labs 6th edition on the PDP-11. man makefs > The code to collect and write all of an existing filesystem's > directories, followed by all of its files, exists in dump(8). > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" >
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