Coly Li 6180bb446a dax: fix detection of dax support for non-persistent memory block devices ... When calling __generic_fsdax_supported(), a dax-unsupported device may not have dax_dev as NULL, e.g. the dax related code block is not enabled by Kconfig. Therefore in __generic_fsdax_supported(), to check whether a device supports DAX or not, the following order of operations should be performed: - If dax_dev pointer is NULL, it means the device driver explicitly announce it doesn't support DAX. Then it is OK to directly return false from __generic_fsdax_supported(). - If dax_dev pointer is NOT NULL, it might be because the driver doesn't support DAX and not explicitly initialize related data structure. Then bdev_dax_supported() should be called for further check. If device driver desn't explicitly set its dax_dev pointer to NULL, this is not a bug. Calling bdev_dax_supported() makes sure they can be recognized as dax-unsupported eventually. Fixes: c2affe920b ("dax: do not print error message for non-persistent memory block device") Cc: Jan Kara <jack@suse.com> Cc: Vishal Verma <vishal.l.verma@intel.com> Reviewed-and-tested-by: Adrian Huang <ahuang12@lenovo.com> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Reviewed-by: Mike Snitzer <snitzer@redhat.com> Reviewed-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com> Signed-off-by: Coly Li <colyli@suse.de> Signed-off-by: Vishal Verma <vishal.l.verma@intel.com> Link: https://lore.kernel.org/r/20200903161625.19524-1-colyli@suse.de		2020-09-03 12:28:03 -06:00
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pmem	libnvdimm/namespace: Differentiate between probe mapping and runtime mapping	2019-11-14 19:08:47 -08:00
bus.c	dax: Move mandatory ->zero_page_range() check in alloc_dax()	2020-04-02 19:15:03 -07:00
bus.h	dax: Fix alloc_dax_region() compile warning	2019-11-07 15:44:47 +01:00
dax-private.h	device-dax: add memory via add_memory_driver_managed()	2020-06-04 19:06:23 -07:00
device.c	vfs: track per-sb writeback errors and report them to syncfs	2020-06-02 10:59:05 -07:00
hmem.c	device-dax: Add a driver for "hmem" devices	2019-11-07 15:45:00 +01:00
Kconfig	device-dax: Add a driver for "hmem" devices	2019-11-07 15:45:00 +01:00
kmem.c	device-dax: add memory via add_memory_driver_managed()	2020-06-04 19:06:23 -07:00
Makefile	device-dax: Add a driver for "hmem" devices	2019-11-07 15:45:00 +01:00
super.c	dax: fix detection of dax support for non-persistent memory block devices	2020-09-03 12:28:03 -06:00