From f26c5719b2d7b00de69eb83eb1c1c831759fdc9b Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 12 Apr 2017 12:35:44 -0700 Subject: 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 Reviewed-by: Mike Snitzer Signed-off-by: Dan Williams --- include/linux/device-mapper.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux/device-mapper.h') diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index a7e6903..bcba4d8 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -130,6 +130,7 @@ typedef int (*dm_busy_fn) (struct dm_target *ti); */ typedef long (*dm_direct_access_fn) (struct dm_target *ti, sector_t sector, void **kaddr, pfn_t *pfn, long size); +#define PAGE_SECTORS (PAGE_SIZE / 512) void dm_error(const char *message); -- cgit v1.1