dm: Call proper helper to determine dax support
authorJan Kara <jack@suse.cz>
Sun, 20 Sep 2020 15:54:42 +0000 (08:54 -0700)
committerDan Williams <dan.j.williams@intel.com>
Sun, 20 Sep 2020 15:55:09 +0000 (08:55 -0700)
commite2ec5128254518cae320d5dc631b71b94160f663
tree1127fbd05a2269d92dff9896b3e59086be65863f
parent02186d8897d49b0afd3c80b6cf23437d91024065
dm: Call proper helper to determine dax support

DM was calling generic_fsdax_supported() to determine whether a device
referenced in the DM table supports DAX. However this is a helper for "leaf" device drivers so that
they don't have to duplicate common generic checks. High level code
should call dax_supported() helper which that calls into appropriate
helper for the particular device. This problem manifested itself as
kernel messages:

dm-3: error: dax access failed (-95)

when lvm2-testsuite run in cases where a DM device was stacked on top of
another DM device.

Fixes: 7bf7eac8d648 ("dax: Arrange for dax_supported check to span multiple devices")
Cc: <stable@vger.kernel.org>
Tested-by: Adrian Huang <ahuang12@lenovo.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/r/160061715195.13131.5503173247632041975.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
drivers/dax/super.c
drivers/md/dm-table.c
include/linux/dax.h