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: Toshi Kani <toshi.kani@hpe.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index 48f1c01..01bb9cf 100644
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -308,6 +308,29 @@
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 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 @@
.status = stripe_status,
.iterate_devices = stripe_iterate_devices,
.io_hints = stripe_io_hints,
+ .direct_access = stripe_direct_access,
};
int __init dm_stripe_init(void)