The ext4 patchset for 2.6.28 contains several fixes as well as,
ultimately, a change in the name of the filesystem from "ext4dev" to
"ext4." (*) - I've pulled this in for F10.

This will also require an updated e2fsprogs, because there was a bug in
blkid which failed to recognize older "ext4dev" filesystems (those with
the test_fs flag set) as ext4, as it should have. This caused them to
not mount automatically.

So long story short, you'll need to update kernel & e2fsprogs together,
if you have ext4(dev) filesystems and you need them to mount seamlessly.
It's recoverable (just a mounting failure) but I don't want anyone to
be too surprised.

There are anaconda changes as well, so until anaconda gets in sync,
installs on ext4 may not work (that renaming patch has been sent, too).

Thanks,
-Eric

(*)Yes, this does indicate that the ext4 developers feel it's time to
move on past the "dev" stage; as the patch says "The ext4 filesystem is
getting stable enough that it's time to drop the "dev" prefix." - as
with any filesystem, though, I still encourage you to back up important
data

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On Thu, 2008-10-09 at 08:04 -0500, Eric Sandeen wrote:

> (*)Yes, this does indicate that the ext4 developers feel it's time to
> move on past the "dev" stage; as the patch says "The ext4 filesystem is
> getting stable enough that it's time to drop the "dev" prefix." - as
> with any filesystem, though, I still encourage you to back up important
> data

Does this mean ext4 will be available as generic during
installs/upgrades, same as ext3? Or does it have to be given as an
option during install to get it to show up?

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Mike Chambers wrote:
> On Thu, 2008-10-09 at 08:04 -0500, Eric Sandeen wrote:
>
>> (*)Yes, this does indicate that the ext4 developers feel it's time to
>> move on past the "dev" stage; as the patch says "The ext4 filesystem is
>> getting stable enough that it's time to drop the "dev" prefix." - as
>> with any filesystem, though, I still encourage you to back up important
>> data
>
> Does this mean ext4 will be available as generic during
> installs/upgrades, same as ext3? Or does it have to be given as an
> option during install to get it to show up?

it still takes the ext4 option on boot.

-Eric

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Eric Sandeen wrote:
> The ext4 patchset for 2.6.28 contains several fixes as well as,
> ultimately, a change in the name of the filesystem from "ext4dev" to
> "ext4." (*) - I've pulled this in for F10.
>
> This will also require an updated e2fsprogs, because there was a bug in
> blkid which failed to recognize older "ext4dev" filesystems (those with
> the test_fs flag set) as ext4, as it should have. This caused them to
> not mount automatically.
>
> So long story short, you'll need to update kernel & e2fsprogs together,
> if you have ext4(dev) filesystems and you need them to mount seamlessly.
> It's recoverable (just a mounting failure) but I don't want anyone to
> be too surprised.

aaaand that turns out to be insufficient.

Changing /etc/fstab to list "ext4" for the root fs may be enough, do it
before you install the new kernel.

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.

Thanks,
-Eric

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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.


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2008/10/9 Eric Sandeen <sandeen@redhat.com>:
> Mike Chambers wrote:
>> On Thu, 2008-10-09 at 08:04 -0500, Eric Sandeen wrote:
>>
>>> (*)Yes, this does indicate that the ext4 developers feel it's time to
>>> move on past the "dev" stage; as the patch says "The ext4 filesystem is
>>> getting stable enough that it's time to drop the "dev" prefix." - as
>>> with any filesystem, though, I still encourage you to back up important
>>> data
>>
>> Does this mean ext4 will be available as generic during
>> installs/upgrades, same as ext3? Or does it have to be given as an
>> option during install to get it to show up?
>
> it still takes the ext4 option on boot.

Oh come on - that makes it barely differential between
iamanext4developer. Put your nuts on the line and offer it up as an
additional option on install - I dare you. I thought Fedora was
bleeding edge! I miss that heart-racing feeling when I _just dont
know_ if my data is coming back up on reboot...


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Christopher Brown wrote:
> 2008/10/9 Eric Sandeen <sandeen@redhat.com>:
>> Mike Chambers wrote:
>>> On Thu, 2008-10-09 at 08:04 -0500, Eric Sandeen wrote:
>>>
>>>> (*)Yes, this does indicate that the ext4 developers feel it's time to
>>>> move on past the "dev" stage; as the patch says "The ext4 filesystem is
>>>> getting stable enough that it's time to drop the "dev" prefix." - as
>>>> with any filesystem, though, I still encourage you to back up important
>>>> data
>>> Does this mean ext4 will be available as generic during
>>> installs/upgrades, same as ext3? Or does it have to be given as an
>>> option during install to get it to show up?
>> it still takes the ext4 option on boot.
>
> Oh come on - that makes it barely differential between
> iamanext4developer. Put your nuts on the line and offer it up as an
> additional option on install - I dare you. I thought Fedora was
> bleeding edge! I miss that heart-racing feeling when I _just dont
> know_ if my data is coming back up on reboot...

too late for the fedora feature process, otherwise I'd be tempted....

-Eric

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2008/10/10 Eric Sandeen <sandeen@redhat.com>:
> Christopher Brown wrote:
>> 2008/10/9 Eric Sandeen <sandeen@redhat.com>:
>>> Mike Chambers wrote:
>>>> On Thu, 2008-10-09 at 08:04 -0500, Eric Sandeen wrote:
>>>>
>>>>> (*)Yes, this does indicate that the ext4 developers feel it's time to
>>>>> move on past the "dev" stage; as the patch says "The ext4 filesystem is
>>>>> getting stable enough that it's time to drop the "dev" prefix." - as
>>>>> with any filesystem, though, I still encourage you to back up important
>>>>> data
>>>> Does this mean ext4 will be available as generic during
>>>> installs/upgrades, same as ext3? Or does it have to be given as an
>>>> option during install to get it to show up?
>>> it still takes the ext4 option on boot.
>>
>> Oh come on - that makes it barely differential between
>> iamanext4developer. Put your nuts on the line and offer it up as an
>> additional option on install - I dare you. I thought Fedora was
>> bleeding edge! I miss that heart-racing feeling when I _just dont
>> know_ if my data is coming back up on reboot...
>
> too late for the fedora feature process, otherwise I'd be tempted....

Fair enough. I'll settle for default on F11 then.


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>>>> (*)Yes, this does indicate that the ext4 developers feel it's time to
>>>> move on past the "dev" stage; as the patch says "The ext4 filesystem is
>>>> getting stable enough that it's time to drop the "dev" prefix." - as
>>>> with any filesystem, though, I still encourage you to back up important
>>>> data
>>>
>>> Does this mean ext4 will be available as generic during
>>> installs/upgrades, same as ext3? Or does it have to be given as an
>>> option during install to get it to show up?
>>
>> it still takes the ext4 option on boot.
>
> Oh come on - that makes it barely differential between
> iamanext4developer. Put your nuts on the line and offer it up as an
> additional option on install - I dare you. I thought Fedora was
> bleeding edge! I miss that heart-racing feeling when I _just dont
> know_ if my data is coming back up on reboot...

Are you going to put your nuts on the line and provide the support to
the end users when they don't get their data back on reboot?

Peter

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Christopher Brown wrote:


Fair enough. I'll settle for default on F11 then.


Considering the btrfs roadmap, It might very well be the default. Eric
Sandeen seems to have missed his only opportunity ;-)


Rahul


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