Aneesh Kumar K.V <aneesh.ku...@linux.ibm.com> writes:
> "Verma, Vishal L" <vishal.l.ve...@intel.com> writes:
>
>> On Wed, 2019-08-07 at 10:14 +0530, Aneesh Kumar K.V wrote:
>>> When using reconfigure command to add a `name` to the namespace we end
>>> up updating the align attribute. Avoid this by using the value from
>>> the original namespace. Do this only if we are keeping the namespace mode
>>> same.
>>>
>>> Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.ibm.com>
>>> ---
>>> ndctl/namespace.c | 16 ++++++++++++++++
>>> 1 file changed, 16 insertions(+)
>>
>> Hi Aneesh,
>>
>> A few comments below:
>>
>>>
>>> diff --git a/ndctl/namespace.c b/ndctl/namespace.c
>>> index 1f212a2b3a9b..24e51bb35ae1 100644
>>> --- a/ndctl/namespace.c
>>> +++ b/ndctl/namespace.c
>>> @@ -596,6 +596,22 @@ static int validate_namespace_options(struct
>>> ndctl_region *region,
>>> return -ENXIO;
>>> }
>>> } else {
>>> +
>>> + /*
>>> + * If we are tryint to reconfigure with the same namespace mode
>>
>> ^trying
>>
>>> + * Use the align details from the origin namespace. Otherwise
>>
>> s/origin/original/
>>
>>> + * pick the align details from seed namespace
>>> + */
>>> + if (ndns && p->mode == ndctl_namespace_get_mode(ndns)) {
>>
>> Do we need to depend on the mode here?
>>
>> I'm thinking it should be sufficient to do:
>> 1. Check We're in 'reconfigure'
>> 2. Check param.align was not supplied
>> 3. Get alignment from the pfn/dax personality, and just use that.
>>
>> Does this make sense (Maybe I'm missing something).
>
> We want to use the align value from the seed when we are trying
> to reconfigure a namespace with a different mode. ie, if we are moving a
> fsdax namespace with align value 64K to a devdax, IMHO we should pick 16M
> as alignment for devdax.
>
>>
>>> + struct ndctl_pfn *ns_pfn =
>>> ndctl_namespace_get_pfn(ndns);
>>> + struct ndctl_dax *ns_dax =
>>> ndctl_namespace_get_dax(ndns);
>>> + if (ns_pfn)
>>> + p->align = ndctl_pfn_get_align(ns_pfn);
>>> + else if (ns_dax)
>>> + p->align = ndctl_dax_get_align(ns_dax);
>>> + else
>>> + p->align = sysconf(_SC_PAGE_SIZE);
>>
>> Do we need the page size fallback here - there are other checks after
>> this point that also do a similar fallback, do they not catch the
>> default case?
>
>
> I did that to simplify the code with that `else if`
>
>>
>>> + } else
>>> /*
>>> * Use the seed namespace alignment as the default if we need
>>> * one. If we don't then use PAGE_SIZE so the size_align
Any update on this.?
-aneesh
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