lkml.org 
[lkml]   [2018]   [Jun]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH v3 1/3] pmem: only set QUEUE_FLAG_DAX for fsdax mode
On Tue, Jun 26, 2018 at 11:58 AM, Mike Snitzer <snitzer@redhat.com> wrote:
> On Tue, Jun 26 2018 at 2:52pm -0400,
> Dan Williams <dan.j.williams@intel.com> wrote:
>
>> On Tue, Jun 26, 2018 at 10:59 AM, Ross Zwisler
>> <ross.zwisler@linux.intel.com> wrote:
>> > QUEUE_FLAG_DAX is an indication that a given block device supports
>> > filesystem DAX and should not be set for PMEM namespaces which are in "raw"
>> > or "sector" modes. These namespaces lack struct page and are prevented
>> > from participating in filesystem DAX.
>> >
>> > Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
>> > Suggested-by: Mike Snitzer <snitzer@redhat.com>
>> > Cc: stable@vger.kernel.org
>>
>> Why is this cc: stable? What is the user visible impact of this change
>> especially given the requirement to validate QUEUE_FLAG_DAX with
>> bdev_dax_supported()? Patch looks good, but it's just a cosmetic fixup
>> afaics.
>
> This isn't cosmetic when you consider that stacking up a DM device is
> looking at this flag to determine whether a table does or does _not_
> support DAX.
>
> So this patch, in conjunction with the other changes in the series, is
> certainly something I'd consider appropriate for stable.

I think this classifies as something that never worked correctly and
is not a regression. It does not identify which commit it is repairing
or the user visible failure mode.

\
 
 \ /
  Last update: 2018-06-26 21:08    [W:0.061 / U:0.176 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site