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authorDan Williams <dan.j.williams@intel.com>2017-04-12 12:35:44 -0700
committerDan Williams <dan.j.williams@intel.com>2017-04-20 11:57:52 -0700
commitf26c5719b2d7b00de69eb83eb1c1c831759fdc9b (patch)
treed2f4dc917d539e7dae0424d7722affdc1cdd2006 /drivers/md/Kconfig
parentb0686260fecaa924d8eff2ace94bee70506bc308 (diff)
dm: add dax_device and dax_operations support
Allocate a dax_device to represent the capacity of a device-mapper instance. Provide a ->direct_access() method via the new dax_operations indirection that mirrors the functionality of the current direct_access support via block_device_operations. Once fs/dax.c has been converted to use dax_operations the old dm_blk_direct_access() will be removed. A new helper dm_dax_get_live_target() is introduced to separate some of the dm-specifics from the direct_access implementation. This enabling is only for the top-level dm representation to upper layers. Converting target direct_access implementations is deferred to a separate patch. Cc: Toshi Kani <toshi.kani@hpe.com> Reviewed-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/md/Kconfig')
-rw-r--r--drivers/md/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
index b7767da50c26..1de8372d9459 100644
--- a/drivers/md/Kconfig
+++ b/drivers/md/Kconfig
@@ -200,6 +200,7 @@ config BLK_DEV_DM_BUILTIN
config BLK_DEV_DM
tristate "Device mapper support"
select BLK_DEV_DM_BUILTIN
+ select DAX
---help---
Device-mapper is a low level volume manager. It works by allowing
people to specify mappings for ranges of logical sectors. Various