[linux-lvm] lvm on initrd

[linux-lvm] lvm on initrd

[Arkadiusz Miskiewicz]

Hi,

Are there any plans to add makefile target which would produce very small + 
features stripped down lvm binary with only two commands:
vgscan vgchange
for usage on initrd images?

Such thing is for example done with mdadm tool for raid arrays: make 
mdassemble produces very small binary which can only assemble arrays (so very 
nice to use on initrd) while there is also mdadm binary with full support for 
everything.
-- 
Arkadiusz Mi¶kiewicz     CS at FoE, Wroclaw University of Technology
arekm.pld-linux.org, 1024/3DB19BBD, JID: arekm.jabber.org, PLD/Linux

Re: [linux-lvm] lvm on initrd

[Luca Berra]

On Sat, Jan 24, 2004 at 01:37:35AM +0100, Arkadiusz Miskiewicz wrote:
>Are there any plans to add makefile target which would produce very small + 
>features stripped down lvm binary with only two commands:
>vgscan vgchange
>for usage on initrd images?
patches for lvm2 are:
http://www.comedia.it/~bluca/cooker/lvm2/lvm2-2.00.08-7mdk/LVM2.2.00.08-diet.patch.bz2

patches for lvm1 are:
http://www.comedia.it/~bluca/cooker/lvm2/lvm1-1.0.8-2mdk/lvm-1.0.8-dietlibc.patch.bz2
http://www.comedia.it/~bluca/cooker/lvm2/lvm1-1.0.8-2mdk/lvm-1.0.8-wrapper.patch.bz2

NB1 the lvm1 patches come originally from redhat, but have been modified
NB2 the urls there might change slightly due to repackaging of rpms, so
if (404) backtrack();

L.

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Luca Berra -- bluca@comedia.it
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Re: [linux-lvm] lvm on initrd

[Arkadiusz Miskiewicz]

Dnia sob 24. stycznia 2004 10:58, Luca Berra napisa³:
> On Sat, Jan 24, 2004 at 01:37:35AM +0100, Arkadiusz Miskiewicz wrote:
> >Are there any plans to add makefile target which would produce very small
> > + features stripped down lvm binary with only two commands:
> >vgscan vgchange
> >for usage on initrd images?
>
> patches for lvm2 are:
> http://www.comedia.it/~bluca/cooker/lvm2/lvm2-2.00.08-7mdk/LVM2.2.00.08-die
>t.patch.bz2
Thanks, I've modified these for my needs.
http://cvs.pld-linux.org/cgi-bin/cvsweb/SOURCES/lvm2-initrd.patch?rev=1.1

Unfortunately this doesn't give any significant size drop:
lvm staticly linked with uClibc and device-mapper lib with all features
-rwxr-xr-x    1 misiek   users      555815 2004-01-25 21:05 initrd-lvm
lvm staticly linked with uClibc and device-mapper lib using my patch above (so 
only vgscan and vgchange functions available)
-rwxr-xr-x    1 root     root       482428 2004-01-25 20:51 initrd-lvm

How these sizes look with dietlibc?

Also some problems with lvm way of checking what command user wants based on 
argv[0] came out:
[root@arm misiek]# /sbin/initrd-lvm
  No such command.  Try 'help'.
[root@arm misiek]# ln -s /sbin/initrd-lvm lvm
[root@arm misiek]# ./lvm
  Please supply an LVM command.
  Available lvm commands:
  Use 'lvm help <command>' for more information

  help            Display help for commands
  vgchange        Change volume group attributes
  vgscan          Search for all volume groups
  version         Display software and driver version information

It would be much better if when argv[0] is not known internally for lvm then 
work as argv[0] = lvm.

> L.

-- 
Arkadiusz Mi¶kiewicz     CS at FoE, Wroclaw University of Technology
arekm.pld-linux.org, 1024/3DB19BBD, JID: arekm.jabber.org, PLD/Linux

Re: [linux-lvm] lvm on initrd

[Luca Berra]

On Sun, Jan 25, 2004 at 09:10:07PM +0100, Arkadiusz Miskiewicz wrote:
>Unfortunately this doesn't give any significant size drop:
>lvm staticly linked with uClibc and device-mapper lib with all features
>-rwxr-xr-x    1 misiek   users      555815 2004-01-25 21:05 initrd-lvm
>lvm staticly linked with uClibc and device-mapper lib using my patch above (so 
>only vgscan and vgchange functions available)
>-rwxr-xr-x    1 root     root       482428 2004-01-25 20:51 initrd-lvm
>
>How these sizes look with dietlibc?

-rwxr-xr-x  1 root root 308180 Jan 23 22:14 /sbin/lvm2-static*

Which is still very big, but reducing it will take significantly more
work.

>Also some problems with lvm way of checking what command user wants based on 
>argv[0] came out:
>[root@arm misiek]# /sbin/initrd-lvm
>  No such command.  Try 'help'.
...
>It would be much better if when argv[0] is not known internally for lvm then 
>work as argv[0] = lvm.
>
unfortunately it seems done the other way around in lvm.c
i found it easier to add possible aliases for lvm in there
http://www.comedia.it/~bluca/cooker/lvm2/lvm2-2.00.08-7mdk/lvm2-alternatives.patch.bz2

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