Dan Williams 7bf7eac8d6 dax: Arrange for dax_supported check to span multiple devices ... Pankaj reports that starting with commit ad428cdb52 "dax: Check the end of the block-device capacity with dax_direct_access()" device-mapper no longer allows dax operation. This results from the stricter checks in __bdev_dax_supported() that validate that the start and end of a block-device map to the same 'pagemap' instance. Teach the dax-core and device-mapper to validate the 'pagemap' on a per-target basis. This is accomplished by refactoring the bdev_dax_supported() internals into generic_fsdax_supported() which takes a sector range to validate. Consequently generic_fsdax_supported() is suitable to be used in a device-mapper ->iterate_devices() callback. A new ->dax_supported() operation is added to allow composite devices to split and route upper-level bdev_dax_supported() requests. Fixes: ad428cdb52 ("dax: Check the end of the block-device...") Cc: <stable@vger.kernel.org> Cc: Ira Weiny <ira.weiny@intel.com> Cc: Dave Jiang <dave.jiang@intel.com> Cc: Keith Busch <keith.busch@intel.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Vishal Verma <vishal.l.verma@intel.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Reviewed-by: Jan Kara <jack@suse.cz> Reported-by: Pankaj Gupta <pagupta@redhat.com> Reviewed-by: Pankaj Gupta <pagupta@redhat.com> Tested-by: Pankaj Gupta <pagupta@redhat.com> Tested-by: Vaibhav Jain <vaibhav@linux.ibm.com> Reviewed-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>		2019-05-20 15:02:08 -07:00
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pmem	dax/pmem: Fix whitespace in dax_pmem	2019-04-22 15:56:20 -07:00
bus.c	device-dax: Add a 'modalias' attribute to DAX 'bus' devices	2019-02-27 21:03:48 -08:00
bus.h	acpi/nfit, device-dax: Identify differentiated memory with a unique numa-node	2019-01-06 21:41:57 -08:00
dax-private.h	acpi/nfit, device-dax: Identify differentiated memory with a unique numa-node	2019-01-06 21:41:57 -08:00
device.c	mm/huge_memory: fix vmf_insert_pfn_{pmd, pud}() crash, handle unaligned addresses	2019-05-14 09:47:44 -07:00
Kconfig	drivers/dax: Allow to include DEV_DAX_PMEM as builtin	2019-05-07 07:48:06 -07:00
kmem.c	device-dax: "Hotplug" persistent memory for use like normal RAM	2019-02-28 10:41:23 -08:00
Makefile	device-dax: "Hotplug" persistent memory for use like normal RAM	2019-02-28 10:41:23 -08:00
super.c	dax: Arrange for dax_supported check to span multiple devices	2019-05-20 15:02:08 -07:00