Ext4 support for LTS kernels (was: Re: [PATCH 3.14] ext4: fix data exposure after a crash)

Ext4 support for LTS kernels (was: Re: [PATCH 3.14] ext4: fix data exposure after a crash)

[Theodore Ts'o]

On Mon, Oct 09, 2017 at 01:05:37PM +0200, Jan Kara wrote:
> On Fri 06-10-17 10:04:41, HUANG Weller (CM/ESW12-CN) wrote:
> > I checked the latest 3.14 source code 3.14.79. I didn't found the below patch.
> 
> Well, I'm not sure who runs the 3.14 stable tree (it's not listed at
> kernel.org). It's up to him to pick up patches...

The announcement of 3.14's End of Life as a stable kernel series was
announced in September 2016.  As far as I know, the fact that 3.14 is
no longer listed on kernel.org means that no one is maintaining 3.14
after Greg K-H declared it to be EOL'ed.

On a side note, I just recently finished an effort to update the ext4
patches for 3.14, 4.1, 4.4, and 4.9.  I've sent those backports and
cherry pick requests to stable@vger.kernel.org.  For details of my
work, at:

https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git

There are testing notes in the signed git tags:

ext4-4.9.54-1
   - https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/tag/?h=ext4-4.9.54-1
ext4-4.4.91-1
   - https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/tag/?h=ext4-4.4.91-1
ext4-4.1.44-1
   - https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/tag/?h=ext4-4.1.44-1
ext4-3.18.74-1
   - https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/tag/?h=ext4-3.18.74-1

.... and on a "when Ted has time / interest basis", the ext4-3.18,
ext4-4.1, ext4-4.4, and ext-4.9 branches in the above repo will be
updated with a rebase against the latest LTS kernel and whatever
patches are needed to minimize xfstests failures that haven't yet
gotten accepted into the LTS kernel versions.

Getting changes into android-common and/or various SOC's BSP kernels
is left as an exercise to the reader.

I suspect that at some point soon, when 4.14 becomes released and
becomes a LTS kernel, I'm going to drop ext4-4.1 and replace it with
ext4-4.14, since very few people seem to be using the 4.1 LTS kernel,
and my time / effort is limited.  If someone is interested in helping
out, please contact me.

					- Ted

Re: Ext4 support for LTS kernels (was: Re: [PATCH 3.14] ext4: fix data exposure after a crash)

[Greg KH]

On Mon, Oct 09, 2017 at 09:20:04AM -0400, Theodore Ts'o wrote:
> On Mon, Oct 09, 2017 at 01:05:37PM +0200, Jan Kara wrote:
> > On Fri 06-10-17 10:04:41, HUANG Weller (CM/ESW12-CN) wrote:
> > > I checked the latest 3.14 source code 3.14.79. I didn't found the below patch.
> > 
> > Well, I'm not sure who runs the 3.14 stable tree (it's not listed at
> > kernel.org). It's up to him to pick up patches...
> 
> The announcement of 3.14's End of Life as a stable kernel series was
> announced in September 2016.  As far as I know, the fact that 3.14 is
> no longer listed on kernel.org means that no one is maintaining 3.14
> after Greg K-H declared it to be EOL'ed.

Yes, 3.14 is dead :)

> On a side note, I just recently finished an effort to update the ext4
> patches for 3.14, 4.1, 4.4, and 4.9.  I've sent those backports and
> cherry pick requests to stable@vger.kernel.org.  For details of my
> work, at:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git
> 
> There are testing notes in the signed git tags:
> 
> ext4-4.9.54-1
>    - https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/tag/?h=ext4-4.9.54-1
> ext4-4.4.91-1
>    - https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/tag/?h=ext4-4.4.91-1
> ext4-4.1.44-1
>    - https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/tag/?h=ext4-4.1.44-1
> ext4-3.18.74-1
>    - https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/tag/?h=ext4-3.18.74-1
> 
> .... and on a "when Ted has time / interest basis", the ext4-3.18,
> ext4-4.1, ext4-4.4, and ext-4.9 branches in the above repo will be
> updated with a rebase against the latest LTS kernel and whatever
> patches are needed to minimize xfstests failures that haven't yet
> gotten accepted into the LTS kernel versions.

Thanks so much for this work.  I think I've gotten most of these for
4.9, 4.4, and 3.18, I've emailed about the ones that didn't apply.

> Getting changes into android-common and/or various SOC's BSP kernels
> is left as an exercise to the reader.

android-common syncs with the lts stable releases, so they should get
picked up by the SoC BSP kernels that way.  As long as your SoC company
is sane...

thanks,

greg k-h

Re: Ext4 support for LTS kernels (was: Re: [PATCH 3.14] ext4: fix data exposure after a crash)

[Greg KH]

On Tue, Oct 10, 2017 at 08:17:10PM +0200, Greg KH wrote:
> On Mon, Oct 09, 2017 at 09:20:04AM -0400, Theodore Ts'o wrote:
> > On Mon, Oct 09, 2017 at 01:05:37PM +0200, Jan Kara wrote:
> > > On Fri 06-10-17 10:04:41, HUANG Weller (CM/ESW12-CN) wrote:
> > > > I checked the latest 3.14 source code 3.14.79. I didn't found the below patch.
> > > 
> > > Well, I'm not sure who runs the 3.14 stable tree (it's not listed at
> > > kernel.org). It's up to him to pick up patches...
> > 
> > The announcement of 3.14's End of Life as a stable kernel series was
> > announced in September 2016.  As far as I know, the fact that 3.14 is
> > no longer listed on kernel.org means that no one is maintaining 3.14
> > after Greg K-H declared it to be EOL'ed.
> 
> Yes, 3.14 is dead :)
> 
> > On a side note, I just recently finished an effort to update the ext4
> > patches for 3.14, 4.1, 4.4, and 4.9.  I've sent those backports and
> > cherry pick requests to stable@vger.kernel.org.  For details of my
> > work, at:
> > 
> > https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git
> > 
> > There are testing notes in the signed git tags:
> > 
> > ext4-4.9.54-1
> >    - https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/tag/?h=ext4-4.9.54-1
> > ext4-4.4.91-1
> >    - https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/tag/?h=ext4-4.4.91-1
> > ext4-4.1.44-1
> >    - https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/tag/?h=ext4-4.1.44-1
> > ext4-3.18.74-1
> >    - https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/tag/?h=ext4-3.18.74-1
> > 
> > .... and on a "when Ted has time / interest basis", the ext4-3.18,
> > ext4-4.1, ext4-4.4, and ext-4.9 branches in the above repo will be
> > updated with a rebase against the latest LTS kernel and whatever
> > patches are needed to minimize xfstests failures that haven't yet
> > gotten accepted into the LTS kernel versions.
> 
> Thanks so much for this work.  I think I've gotten most of these for
> 4.9, 4.4, and 3.18, I've emailed about the ones that didn't apply.

I dug in your branches above, and found the one missing patch for 3.18.
So I think I am all caught up now.

If not, please let me know.

thanks,

greg k-h