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On Wed, 14 Mar 2007 baslinux AT lists.ibiblio.org wrote:

> Message from Steven
> ===================
>
> Sindi wrote:
> > I have been mounting BL3.50 to loop,
>
> I've been having problems with the new busybox mount.
> When I try to mount a CD (after doing the insmods),
> I get a weird permission error.  Loop mounts also
> don't seem right.
>
> I think I'll be going back to the old busybox.  The
> new busybox stuff is just too flakey.  Whether it's
> the the 2.2 kernel or buggy code in busybox, it just
> isn't reliable.
>
> > and BL2 and BL3 mount will not unmount the loop.
>
> Trying mounting the loopfile using losetup:
> ----------------------------
> losetup /dev/loop0  loopfile
> mount /dev/loop0  /mnt
> ...
> umount /mnt
> losetup -d  /dev/loop0
> ----------------------------


BL2 kernel 2.4.31 with LOOP device compiled in

I have busybox132 first on my path, with losetup.  mount is from SW.

This busybox as compiled with uclibc that was compiled by Karolis
with 2.4.31 headers

<#>losetup /dev/loop0 fsimg350
<#> mount /dev/loop0 /mnt
<#>chroot /mnt /bin/sh --login
(I see the files in bl3.50)
<#>exit (back to BL2)
<#>umount /mnt
<#>losetup -d /dev/loop0
losetup:  Segmentation fault

(I also got a segfault when I tried to mount a nonexistent file).

Does this work for you with busybox 1.2.2 losetup?

Busybox 1.1.0 losetup (compiled with the precompiled uclibc): 
/busybox110/losetup (I made links to busybox in that directory) has been 
written just losetup below for clarity:

<#>losetup /dev/loop0 fsimg350
<#>mount /dev/loop0 /mnt
<#>umount /mnt
<#>losetup -d /dev/loop0
losetup:  /dev/loop0:  No such device or address.

Busybox 1.0.1 losetup (compiled by Steven for BL3)

Invoked in BL2 as /bin/busybox/busybox-1.01-uclibc losetup

<#>losetup /dev/loop0 fsimg350
<#>mount /dev/loop0 /mnt
<#>umount /mnt
<#>losetup -d /dev/loop0
losetup: ioctl:  LOOP_CLR_FD:  No such device or address.

Am I missing some device?

Busybox 1.00-pre7 (from some BL3?)
Same behavior as busybox 1.01.

Which losetup works for you?  Did I type something wrong?
Should I be trying this in BL3 not BL2?

I think you use losetup to boot the loop BL but instead of unmounting the 
loop file we just reboot.

> > I will keep a full BL3 e2fsck and use that just in case.
>
> At this stage it appears that BL3.5 will have the same
> e2fsck as 3.4.

Thanks.  Sindi

> Cheers,
> Steven