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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block	dax: Arrange for dax_supported check to span multiple devices	2019-05-20 15:02:08 -07:00
char	stream_open related patches for Linux 5.2	2019-05-07 12:15:13 -07:00
cio	s390/qdio: optimize state inspection of HW-owned SBALs	2019-05-08 15:01:23 +02:00
crypto	stream_open related patches for Linux 5.2	2019-05-07 12:15:13 -07:00
net	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2019-05-07 22:03:58 -07:00
scsi	scsi: zfcp: reduce flood of fcrscn1 trace records on multi-element RSCN	2019-03-27 21:26:12 -04:00
virtio	virtio: fixes, features	2019-05-14 14:12:59 -07:00
Makefile	kbuild: rename built-in.o to built-in.a	2018-03-26 02:01:19 +09:00