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SubjectRe: [PATCH v2 2/7] dax: change bdev_dax_supported() to support boolean returns
On Tue, May 29, 2018 at 04:01:14PM -0600, Ross Zwisler wrote:
> On Tue, May 29, 2018 at 02:25:10PM -0700, Darrick J. Wong wrote:
> > On Tue, May 29, 2018 at 01:51:01PM -0600, Ross Zwisler wrote:
> > > From: Dave Jiang <dave.jiang@intel.com>
> > >
> > > The function return values are confusing with the way the function is
> > > named. We expect a true or false return value but it actually returns
> > > 0/-errno. This makes the code very confusing. Changing the return values
> > > to return a bool where if DAX is supported then return true and no DAX
> > > support returns false.
> > >
> > > Signed-off-by: Dave Jiang <dave.jiang@intel.com>
> > > Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
> >
> > Looks ok, do you want me to pull the first two patches through the xfs
> > tree?
> >
> > Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
>
> Thanks for the review.
>
> I'm not sure what's best. If you do that then Mike will need to have a DM
> branch for the rest of the series based on your stable commits, yea?
>
> Mike what would you prefer?

I /was/ about to say that I would pull in the first two patches, but now
I can't get xfs to mount with pmem at all, and have no way of testing
this...?

# echo 'file drivers/dax/* +p' > /sys/kernel/debug/dynamic_debug/control
# mount /dev/pmem3 -o rtdev=/dev/pmem4,dax /mnt
# dmesg
<snip>
SGI XFS with ACLs, security attributes, realtime, scrub, debug enabled
XFS (pmem3): DAX enabled. Warning: EXPERIMENTAL, use at your own risk
pmem3: error: dax support not enabled
pmem4: error: dax support not enabled
XFS (pmem3): DAX unsupported by block device. Turning off DAX.
XFS (pmem3): Mounting V5 Filesystem
XFS (pmem3): Ending clean mount

Evidently the pfn it picks up is missing PFN_MAP in flags because
ND_REGION_PAGEMAP isn't set, and looking at the kernel source, pmem that
comes in via NFIT never gets that set...?

relevant qemu pmem options:

-object memory-backend-file,id=memnvdimm0,prealloc=no,mem-path=/dev/shm/a.img,share=yes,size=13488881664
-device nvdimm,node=0,memdev=memnvdimm0,id=nvdimm0,slot=0
(repeat for five more devices)

<confused>

--D

NFIT table contents:

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