Commit 84b22f83 authored by Toshi Kani's avatar Toshi Kani Committed by Mike Snitzer
Browse files

dm linear: add DAX support 



Change dm-linear to implement direct_access function,
linear_direct_access(), which maps sector and calls direct_access
function of its physical target device.

Signed-off-by: default avatarToshi Kani <toshi.kani@hpe.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent 545ed20e

drivers/md/dm-linear.c

+20 −1
Original line number Diff line number Diff line
@@ -141,9 +141,27 @@ static int linear_iterate_devices(struct dm_target *ti, 
	return fn(ti, lc->dev, lc->start, ti->len, data);

}



static long linear_direct_access(struct dm_target *ti, sector_t sector,

				 void __pmem **kaddr, pfn_t *pfn, long size)

{

	struct linear_c *lc = ti->private;

	struct block_device *bdev = lc->dev->bdev;

	struct blk_dax_ctl dax = {

		.sector = linear_map_sector(ti, sector),

		.size = size,

	};

	long ret;



	ret = bdev_direct_access(bdev, &dax);

	*kaddr = dax.addr;

	*pfn = dax.pfn;



	return ret;

}



static struct target_type linear_target = {

	.name   = "linear",

	.version = {1, 2, 1},

	.version = {1, 3, 0},

	.module = THIS_MODULE,

	.ctr    = linear_ctr,

	.dtr    = linear_dtr,
@@ -151,6 +169,7 @@ static struct target_type linear_target = { 
	.status = linear_status,

	.prepare_ioctl = linear_prepare_ioctl,

	.iterate_devices = linear_iterate_devices,

	.direct_access = linear_direct_access,

};



int __init dm_linear_init(void)