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
..
dasd_3990_erp.c
dasd_alias.c
dasd_devmap.c
dasd_diag.c
dasd_diag.h
dasd_eckd.c	s390/dasd: fix build warning in dasd_eckd_build_cp_raw	2019-05-09 08:10:21 -06:00
dasd_eckd.h
dasd_eer.c
dasd_erp.c
dasd_fba.c
dasd_fba.h
dasd_genhd.c
dasd_int.h
dasd_ioctl.c
dasd_proc.c	s390/drivers: fix proc/debugfs file permissions	2018-12-13 10:42:24 +01:00
dasd.c	s390/dasd: fix read device characteristic with CONFIG_VMAP_STACK=y	2019-03-01 16:23:56 +01:00
dcssblk.c	dax: Arrange for dax_supported check to span multiple devices	2019-05-20 15:02:08 -07:00
Kconfig
Makefile
scm_blk.c
scm_blk.h
scm_drv.c
xpram.c