Overlayfs backport for kernel v4.9.y

Overlayfs backport for kernel v4.9.y

[Amir Goldstein]

Hi All,

For whom it may concern, I have backported latest overlayfs
features to stable kernel v4.9.y. The patches are available on
overlayfs-4.9.y branch on my github [1]. I intend to update and
test this branch with patches applied to upstream.

This work was verified with with xfstests master branch and
with unionmount-testsuite master branch on my github [2].

DO NOT mistake this for code that can be compiled and loaded
as a kernel module to kernel v4.9.y!
The branch pulls in some minor infrastructure changes that
were required for ease of backporting (mostly uuid_t helpers).
Most of the remaining diff from v4.15-rc1 in overlayfs code
is due to STATX vfs API change.

All backported patches have my S-O-B, but most of them
don't have the upstream commit id in the commit message
expect a few tree wide patches which I selectively picked
their changes only to overlayfs (e.g. add include <cred.h>).

Please feel free to use this code, review my work and test it.

Thanks,
Amir.

[1] https://github.com/amir73il/linux/commits/overlayfs-4.9.y
[2] https://github.com/amir73il/unionmount-testsuite

Re: Overlayfs backport for kernel v4.9.y

[Vivek Goyal]

On Thu, Dec 07, 2017 at 07:14:49PM +0200, Amir Goldstein wrote:
> Hi All,
> 
> For whom it may concern, I have backported latest overlayfs
> features to stable kernel v4.9.y. The patches are available on

Hi Amir,

So what's the plan. Who is going to consume these patches. Will
these be merged somewhere?

Vivek

> overlayfs-4.9.y branch on my github [1]. I intend to update and
> test this branch with patches applied to upstream.
> 
> This work was verified with with xfstests master branch and
> with unionmount-testsuite master branch on my github [2].
> 
> DO NOT mistake this for code that can be compiled and loaded
> as a kernel module to kernel v4.9.y!
> The branch pulls in some minor infrastructure changes that
> were required for ease of backporting (mostly uuid_t helpers).
> Most of the remaining diff from v4.15-rc1 in overlayfs code
> is due to STATX vfs API change.
> 
> All backported patches have my S-O-B, but most of them
> don't have the upstream commit id in the commit message
> expect a few tree wide patches which I selectively picked
> their changes only to overlayfs (e.g. add include <cred.h>).
> 
> Please feel free to use this code, review my work and test it.
> 
> Thanks,
> Amir.
> 
> [1] https://github.com/amir73il/linux/commits/overlayfs-4.9.y
> [2] https://github.com/amir73il/unionmount-testsuite
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Re: Overlayfs backport for kernel v4.9.y

[Amir Goldstein]

On Thu, Dec 7, 2017 at 8:20 PM, Vivek Goyal <vgoyal@redhat.com> wrote:
> On Thu, Dec 07, 2017 at 07:14:49PM +0200, Amir Goldstein wrote:
>> Hi All,
>>
>> For whom it may concern, I have backported latest overlayfs
>> features to stable kernel v4.9.y. The patches are available on
>
> Hi Amir,
>
> So what's the plan. Who is going to consume these patches. Will
> these be merged somewhere?
>

Vivek,

Those patches are for "private consumption". No merge destination.
I am going to maintain a backport branch for overlayfs snapshots,
so I figured I put the patches out there in case somebody has a use for them.

Cheers,
Amir.

Re: Overlayfs backport for kernel v4.9.y

[Amir Goldstein]

On Thu, Dec 7, 2017 at 7:14 PM Amir Goldstein <amir73il@gmail.com> wrote:
>
> Hi All,
>
> For whom it may concern, I have backported latest overlayfs
> features to stable kernel v4.9.y. The patches are available on
> overlayfs-4.9.y branch on my github [1]. I intend to update and
> test this branch with patches applied to upstream.
>
> This work was verified with with xfstests master branch and
> with unionmount-testsuite master branch on my github [2].
>
> DO NOT mistake this for code that can be compiled and loaded
> as a kernel module to kernel v4.9.y!
> The branch pulls in some minor infrastructure changes that
> were required for ease of backporting (mostly uuid_t helpers).
> Most of the remaining diff from v4.15-rc1 in overlayfs code
> is due to STATX vfs API change.
>
> All backported patches have my S-O-B, but most of them
> don't have the upstream commit id in the commit message
> expect a few tree wide patches which I selectively picked
> their changes only to overlayfs (e.g. add include <cred.h>).
>
> Please feel free to use this code, review my work and test it.
>

For whom it may concern, the linux-4.9.y-ovl-* backport branches have
been updated to latest stable branch and latest upstream overlayfs [1].
New linux-4.14.y-ovl-* branches are available on my github [2].

I was chancing was appeared to be a backport bug in linux-4.9.y-ovl-4.17
that eventually turned out to be a real v4.17 overlay NFS export regression
unveiled by different drop_caches behavior in kernel v4.9.

Please note that these branches WILL be rebased as overlayfs fix patches
find their way into the stable tree.

Thanks,
Amir.

[1] https://github.com/amir73il/linux/commits/linux-4.9.y-ovl-next
[2] https://github.com/amir73il/linux/commits/linux-4.14.y-ovl-next