[linux-yocto] [PATCH 1/2] preempt-rt.cfg/standard.cfg: enable OVERLAY_FS

[Bruce Ashfield]

On 2016-03-29 9:51 PM, Robert Yang wrote:
>
>
> On 03/30/2016 09:08 AM, Robert Yang wrote:
>>
>>
>> On 03/29/2016 08:40 PM, Bruce Ashfield wrote:
>>> On 2016-03-29 3:23 AM, Robert Yang wrote:
>>>> Otherwise the live iso will be readonly.
>>>
>>> Not true .. overlayfs is one way to have a read/write ISO, but
>>> not the only.
>>>
>>> This isn't something we bury in the middle of the ktypes. aufs
>>> has always been a standalone configuration option, and one that
>>> is enabled via KERNEL_FEATURES.
>>>
>>> This is an alternative to the exiting aufs use case, and should
>>> be treated a similar way (with a generic feature, an enable and
>>> a disable). See the aufs fragments as a template to follow.
>>
>> Sounds good, I will send a V2.
>
> Hi Bruce,
>
> After more investigations, linux-yocto 4.4 does have
> features/aufs/aufs.scc,
> but I can't find any source of aufs in kernel-source, I'm afraid that
> linux-yocto doesn't merge aufs' patch. And when I added

aufs simply comes along later in the cycle. Since I do the
merges, I'd know if it was missed or not :)

> features/aufs/aufs.scc
> to KERNEL_FEATURES, I got this in merge_log.txt:
>
> Value requested for CONFIG_AUFS_FS not in final .config
> Requested value:  CONFIG_AUFS_FS=y
> Actual value:
>
> Since overlayfs has been merged by mainline, maybe we can drop aufs
> support ?

Nope .. aufs is still supported, since it has different features
than overlayfs. There is not "one union filesystem to rule them
all".

Bruce

>
> // Robert
>
>>
>> // Robert
>>
>>>
>>> Bruce
>>>
>>>>
>>>> Signed-off-by: Robert Yang <liezhi.yang at windriver.com>
>>>> ---
>>>>   ktypes/preempt-rt/preempt-rt.cfg | 2 ++
>>>>   ktypes/standard/standard.cfg     | 2 ++
>>>>   2 files changed, 4 insertions(+)
>>>>
>>>> diff --git a/ktypes/preempt-rt/preempt-rt.cfg
>>>> b/ktypes/preempt-rt/preempt-rt.cfg
>>>> index 4c62804..c4a5617 100644
>>>> --- a/ktypes/preempt-rt/preempt-rt.cfg
>>>> +++ b/ktypes/preempt-rt/preempt-rt.cfg
>>>> @@ -1116,3 +1116,5 @@ CONFIG_CRYPTO_TEST=m
>>>>   #
>>>>   CONFIG_LIBCRC32C=m
>>>>   CONFIG_ZLIB_DEFLATE=m
>>>> +
>>>> +CONFIG_OVERLAY_FS=y
>>>> diff --git a/ktypes/standard/standard.cfg
>>>> b/ktypes/standard/standard.cfg
>>>> index b3dbde5..4099fda 100644
>>>> --- a/ktypes/standard/standard.cfg
>>>> +++ b/ktypes/standard/standard.cfg
>>>> @@ -1108,3 +1108,5 @@ CONFIG_LIBCRC32C=m
>>>>   CONFIG_ZLIB_DEFLATE=m
>>>>
>>>>   CONFIG_SHMEM=y
>>>> +
>>>> +CONFIG_OVERLAY_FS=y
>>>>
>>>
>>>