On Thu, May 16, 2019 at 10:37 PM Vaibhav Jain <[email protected]> wrote: > > Dan Williams <[email protected]> writes: > > > On Wed, May 15, 2019 at 10:55 PM Vaibhav Jain <[email protected]> wrote: > >> > >> Presently __bdev_dax_supported() checks if first sector of last > >> page ( last_page ) on the block device is aligned to page > >> boundary. However the code to compute 'last_page' assumes that there > >> are 8 sectors/page assuming a 4K page-size. > >> > >> This assumption breaks on architectures which use a different page > >> size specifically PPC64 where page-size == 64K. Hence a warning is > >> seen while trying to mount a xfs/ext4 file-system with dax enabled: > >> > >> $ sudo mount -o dax /dev/pmem0 /mnt/pmem > >> XFS (pmem0): DAX enabled. Warning: EXPERIMENTAL, use at your own risk > >> XFS (pmem0): DAX unsupported by block device. Turning off DAX. > >> > >> The patch fixes this issue by updating calculation of 'last_var' to > >> take into account number-of-sectors/page instead of assuming it to be > >> '8'. > > > > Yes, I noticed this too and fixed it up in a wider change that also > > allows device-mapper to validate each component device. Does this > > patch work for you? > > > > https://lore.kernel.org/lkml/155789172402.748145.11853718580748830476.st...@dwillia2-desk3.amr.corp.intel.com/ > > Thanks Dan, I tested your patch and not seeing the issue anymore.
Thanks, I recorded a "Tested-by" for you.
