Re: UnionMount status?

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On 18 August 2010 21:06, Valerie Aurora <vaurora@xxxxxxxxxx> wrote:
> On Wed, Aug 18, 2010 at 01:30:38PM +0200, Michal Suchanek wrote:
>> On 17 August 2010 21:51, Valerie Aurora <vaurora@xxxxxxxxxx> wrote:
>> > On Tue, Aug 17, 2010 at 04:31:48PM +0200, Michal Suchanek wrote:
>> >> On 17 August 2010 14:03, Michal Suchanek <hramrach@xxxxxxxxxx> wrote:
>> >> > On 16 August 2010 20:52, Valerie Aurora <vaurora@xxxxxxxxxx> wrote:
>> >> >>
>> >> >> Thanks for attaching your .config. ??CONFIG_UNION_MOUNT wasn't set:
>> >> >>
>> >> >> # CONFIG_UNION_MOUNT is not set
>> >> >>
>> >> >> Try rebuilding with that on. ??Yes, it should build without
>> >> >> CONFIG_UNION_MOUNT and I'll test that for next release.
>> >> >>
>> >> >> -VAL
>> >> >>
>> >> >
>> >> > Sorry, I thought I enabled it.
>> >> >
>> >> > Anyway, I changed that option in the config but it still does not build.
>> >> >
>> >>
>> >> OK, a build without the ext2 filesystem works.
>> >>
>> >> Now when I try to mount the filesystem I get:
>> >>
>> >> ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ??(initramfs) mount_full -t tmpfs -o union tmpfs /root
>> >> ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? [ ?? 43.403419] tmpfs: No value for mount option
>> >> 'union'
>> >> ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? mount: wrong fs type, bad option, bad superblock
>> >> on tmpfs,
>> >> ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ??missing codepage or helper program, or other error
>> >> ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ??(for several filesystems (e.g. nfs, cifs) you might
>> >> ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ??need a /sbin/mount.<type> helper program)
>> >> ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ??In some cases useful info is found in syslog - try
>> >> ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ??dmesg | tail ??or so
>> >>
>> >> I wonder if the docs are out of date. They suggest to only add -o union.
>> >>
>> >> I think it used to work, I recycled the scripts that produced the
>> >> halfway-booting system last time.
>> >
>> > Hm, does mount_full call the new mount binary built from the union
>> > mounts util-linux-ng git tree? ??You can find the git tree here:
>> >
>> > http://valerieaurora.org/union/
>> >
>> Yes, that's the problem. I installed a wrong package and the mount
>> command did not get updated.
>>
>> I copy it as moutn_full into initramfs because mount is normally
>> something from klibc or busybox.
>>
>> A dmesg can be found here:  http://paste.debian.net/84100
>>
>> The system often boots but some features fail at random probably
>> depending on the part of init which is affected by the unionmount
>> failures.
>
> Thanks a ton!  Al just told me to rewrite that part of the code
> completely.  The good news is the new version will have fewer
> pointers to be unexpectedly NULL. :)
>

Actually, if I read the code correctly the pointer is unexpectedly
non-null as it is supposed to be allocated in the function in
question.

Thanks

Michal
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