Heads up on ext4 changes

[Tom London]

On Sat, Oct 11, 2008 at 2:45 PM, Eric Sandeen <sandeen at redhat.com> wrote:
> Tom London wrote:
>> On Fri, Oct 10, 2008 at 12:10 PM, Eric Sandeen <sandeen at redhat.com> wrote:
>>> Eric Sandeen wrote:
>>>
>>>> Changing /etc/fstab to list "ext4" for the root fs may be enough, do it
>>>> before you install the new kernel.
>>> On further reflection, you will probably just have to do this.
>>>
>>> -Eric
>>>
>>>> notting suggested a module alias to ext4dev in the ext4.ko module
>>>> itself, that sounds like a good plan and as long as it gets upstream
>>>> I'll commit it to Fedora shortly, and I think that should make it all
>>>> seamless.
>>>
>> I have an 'ext4' FS on a USB hard drive.  When I plug this in, I get a
>> "Cannot mount volume" popup:
>>
>> The volume 'Backup1' uses the ext4dev file system which is not
>> supported by your system, followed by a dbus-type failure error
>> message about a minute later.
>>
>> This just me, or what additional changes are needed?
>
> Do you have the most recent e2fsprogs?  And/or what does blkid
> /dev/whatever say... if it says ext4dev, try newer e2fsprogs - blkid had
> a bug that caused it to say "ext4dev" when "ext4" is what we wanted.
>
> Going forward I think we'll register both ext4 & ext4dev from the ext4
> kernel module, at least for a while, so that "mount -t ext4dev" will
> work still work in the transition period.
>
> Sorry for all the hassle :)
>
> -Eric
>
No hassle, this is fun! ;)

Anyway:

[root at tlondon ~]# rpm -q e2fsprogs
e2fsprogs-1.41.2-2.fc10.i386
[root at tlondon ~]# blkid /dev/sdb1
/dev/sdb1: LABEL="Backup1" UUID="7066e635-fe1f-4cf8-94a6-1a3e9229a44c"
TYPE="ext4"
[root at tlondon ~]#

Guessing that something is compiled with 'ext4dev' (not 'ext4'), I did
'strings | grep ext4' in the usual places (/bin, /sbin, /usr/bin,
/usr/sbin/, /usr/libexec, /usr/lib).  Here is what I got (omitting
those that appeared to have both 'ext4' and ext4dev'):

/sbin/quotacheck
ext4dev
/sbin/quotaoff
ext4dev
/sbin/quotaon
ext4dev
/usr/bin/quota
ext4dev
/usr/sbin/convertquota
ext4dev
/usr/sbin/edquota
ext4dev
/usr/sbin/repquota
ext4dev
/usr/sbin/rpc.rquotad
ext4dev
/usr/sbin/setquota
ext4dev
/usr/sbin/warnquota
ext4dev

So I'm guessing those (all quota related) need updating.  Don't think
this has anything to do with my 'issue', however.

Anyway, I can mount manually for now. Sorry I couldn't quickly figure
out what was doing this.....

tom
-- 
Tom London