[gentoo-dev] ziso rather than cloop

[gentoo-dev] ziso rather than cloop

[Justin Whitney]

I'm new here (and new to gentoo) so please forgive me if this has been
discussed before.  I've been working with your 1.4rc3 release, adding
support for loopback encrypted filesystems.  Everything boots fine, but
as the kernel I'm using doesn't have cloop support (yet), it failed at
the livecd load stage.  My next step is of course to add cloop support
to my kernel, and all *should* be well... 

It seems, though, that your use of cloop is less widely supported than
other solutions - it would perhaps be more robust to use the ziso
transparent iso decompression extension which is present in 2.4 kernels,
even (at least it is in my 21-pre6 kernel), for example.  So I'm
wondering why the choice of cloop over zisofs?

Thanks,

Justin Whitney


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Re: [gentoo-dev] ziso rather than cloop

[Jon Portnoy]

I think cloop has a much better compression ratio, but I don't know for 
sure. I'm CC'ing lu_zero on this because I seem to recall him being the 
cloop guy...

On Sat, Apr 05, 2003 at 02:48:27PM -0500, Justin Whitney wrote:
> I'm new here (and new to gentoo) so please forgive me if this has been
> discussed before.  I've been working with your 1.4rc3 release, adding
> support for loopback encrypted filesystems.  Everything boots fine, but
> as the kernel I'm using doesn't have cloop support (yet), it failed at
> the livecd load stage.  My next step is of course to add cloop support
> to my kernel, and all *should* be well... 
> 
> It seems, though, that your use of cloop is less widely supported than
> other solutions - it would perhaps be more robust to use the ziso
> transparent iso decompression extension which is present in 2.4 kernels,
> even (at least it is in my 21-pre6 kernel), for example.  So I'm
> wondering why the choice of cloop over zisofs?
> 
> Thanks,
> 
> Justin Whitney
> 
> 
> --
> gentoo-dev@gentoo.org mailing list

-- 
Jon Portnoy
avenj/irc.freenode.net

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Re: [gentoo-dev] ziso rather than cloop

[Sylvain]

Hello !

I was also thinking about the same way until I found this :

http://www.aful.org/wws/arc/demolinux-dev/2002-01/msg00006.html
http://www.aful.org/wws/arc/demolinux-dev/2002-01/msg00027.html

Make your own idea :-)

regards,

sylvain

Le 05 Apr 2003 14:48:27 -0500
Justin Whitney <ripple.gentoo@ripple.be> a écrit:

> I'm new here (and new to gentoo) so please forgive me if this has been
> discussed before.  I've been working with your 1.4rc3 release, adding
> support for loopback encrypted filesystems.  Everything boots fine, but
> as the kernel I'm using doesn't have cloop support (yet), it failed at
> the livecd load stage.  My next step is of course to add cloop support
> to my kernel, and all *should* be well... 
> 
> It seems, though, that your use of cloop is less widely supported than
> other solutions - it would perhaps be more robust to use the ziso
> transparent iso decompression extension which is present in 2.4 kernels,
> even (at least it is in my 21-pre6 kernel), for example.  So I'm
> wondering why the choice of cloop over zisofs?
> 
> Thanks,
> 
> Justin Whitney
> 
> 
> --
> gentoo-dev@gentoo.org mailing list
> 

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Re: [gentoo-dev] ziso rather than cloop

[Jon Portnoy]

Reply from lu_zero on IRC was:

<lu_zero> I'd avoid zisofs just because of the overhead

If you'd like a more in-depth explanation, he might be able to provide 
you with one if you emailed lu_zero@gentoo.org...

On Sat, Apr 05, 2003 at 02:48:27PM -0500, Justin Whitney wrote:
> I'm new here (and new to gentoo) so please forgive me if this has been
> discussed before.  I've been working with your 1.4rc3 release, adding
> support for loopback encrypted filesystems.  Everything boots fine, but
> as the kernel I'm using doesn't have cloop support (yet), it failed at
> the livecd load stage.  My next step is of course to add cloop support
> to my kernel, and all *should* be well... 
> 
> It seems, though, that your use of cloop is less widely supported than
> other solutions - it would perhaps be more robust to use the ziso
> transparent iso decompression extension which is present in 2.4 kernels,
> even (at least it is in my 21-pre6 kernel), for example.  So I'm
> wondering why the choice of cloop over zisofs?
> 
> Thanks,
> 
> Justin Whitney
> 
> 
> --
> gentoo-dev@gentoo.org mailing list

-- 
Jon Portnoy
avenj/irc.freenode.net

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Re: [gentoo-dev] ziso rather than cloop

[Daniel Robbins]

On Sat, Apr 05, 2003 at 02:48:27PM -0500, Justin Whitney wrote:
> It seems, though, that your use of cloop is less widely supported than
> other solutions - it would perhaps be more robust to use the ziso
> transparent iso decompression extension which is present in 2.4 kernels,
> even (at least it is in my 21-pre6 kernel), for example.  So I'm
> wondering why the choice of cloop over zisofs?

zisofs actually has a lot of strange problems, enough to make it fairly
unusable for production use. The reason why you are having problems is
that the cloop.o module is not a kernel option, and is built for our 
initrd to match the kernel that is used to boot gentoo. So swapping
in a new kernel could cause things to fail.

-- 
Daniel Robbins
Chief Architect, Gentoo Linux
http://www.gentoo.org

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Re: [gentoo-dev] ziso rather than cloop

[Sylvain]

I already tryed to make bootable cd with ziso instead of cloop method,
and i had to uncompress some files, because of IO error on them.
i didn't understood why...
The problem doesn't come frfom poor quality cd, since i have it on loop mounted ziso
images.

Le Sat, 5 Apr 2003 22:00:50 -0700
Daniel Robbins <drobbins@gentoo.org> a écrit:

> On Sat, Apr 05, 2003 at 02:48:27PM -0500, Justin Whitney wrote:
> > It seems, though, that your use of cloop is less widely supported than
> > other solutions - it would perhaps be more robust to use the ziso
> > transparent iso decompression extension which is present in 2.4 kernels,
> > even (at least it is in my 21-pre6 kernel), for example.  So I'm
> > wondering why the choice of cloop over zisofs?
> 
> zisofs actually has a lot of strange problems, enough to make it fairly
> unusable for production use. The reason why you are having problems is
> that the cloop.o module is not a kernel option, and is built for our 
> initrd to match the kernel that is used to boot gentoo. So swapping
> in a new kernel could cause things to fail.
> 
> -- 
> Daniel Robbins
> Chief Architect, Gentoo Linux
> http://www.gentoo.org
> 
> --
> gentoo-dev@gentoo.org mailing list
> 

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