Commit beec25b4 authored by Toshi Kani's avatar Toshi Kani Committed by Mike Snitzer
Browse files

dm stripe: add DAX support 



Change dm-stripe to implement direct_access function,
stripe_direct_access(), which maps bdev and 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 f8df1fdf

drivers/md/dm-stripe.c

+25 −1
Original line number Diff line number Diff line
@@ -308,6 +308,29 @@ static int stripe_map(struct dm_target *ti, struct bio *bio) 
	return DM_MAPIO_REMAPPED;

}



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

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

{

	struct stripe_c *sc = ti->private;

	uint32_t stripe;

	struct block_device *bdev;

	struct blk_dax_ctl dax = {

		.size = size,

	};

	long ret;



	stripe_map_sector(sc, sector, &stripe, &dax.sector);



	dax.sector += sc->stripe[stripe].physical_start;

	bdev = sc->stripe[stripe].dev->bdev;



	ret = bdev_direct_access(bdev, &dax);

	*kaddr = dax.addr;

	*pfn = dax.pfn;



	return ret;

}



/*

 * Stripe status:

 *
@@ -416,7 +439,7 @@ static void stripe_io_hints(struct dm_target *ti, 


static struct target_type stripe_target = {

	.name   = "striped",

	.version = {1, 5, 1},

	.version = {1, 6, 0},

	.module = THIS_MODULE,

	.ctr    = stripe_ctr,

	.dtr    = stripe_dtr,
@@ -425,6 +448,7 @@ static struct target_type stripe_target = { 
	.status = stripe_status,

	.iterate_devices = stripe_iterate_devices,

	.io_hints = stripe_io_hints,

	.direct_access = stripe_direct_access,

};



int __init dm_stripe_init(void)