dm: teach dm-targets to use a dax_device + dax_operations
Arrange for dm to lookup the dax services available from member devices.
Update the dax-capable targets, linear and stripe, to route dax
operations to the underlying device. Changes the target-internal
->direct_access() method to more closely align with the dax_operations
->direct_access() calling convention.
Cc: Toshi Kani <toshi.kani@hpe.com>
Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index 28193a5..cb4b1e9 100644
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -11,6 +11,7 @@
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/bio.h>
+#include <linux/dax.h>
#include <linux/slab.h>
#include <linux/log2.h>
@@ -308,27 +309,25 @@
return DM_MAPIO_REMAPPED;
}
-static long stripe_direct_access(struct dm_target *ti, sector_t sector,
- void **kaddr, pfn_t *pfn, long size)
+static long stripe_dax_direct_access(struct dm_target *ti, pgoff_t pgoff,
+ long nr_pages, void **kaddr, pfn_t *pfn)
{
+ sector_t dev_sector, sector = pgoff * PAGE_SECTORS;
struct stripe_c *sc = ti->private;
- uint32_t stripe;
+ struct dax_device *dax_dev;
struct block_device *bdev;
- struct blk_dax_ctl dax = {
- .size = size,
- };
+ uint32_t stripe;
long ret;
- stripe_map_sector(sc, sector, &stripe, &dax.sector);
-
- dax.sector += sc->stripe[stripe].physical_start;
+ stripe_map_sector(sc, sector, &stripe, &dev_sector);
+ dev_sector += sc->stripe[stripe].physical_start;
+ dax_dev = sc->stripe[stripe].dev->dax_dev;
bdev = sc->stripe[stripe].dev->bdev;
- ret = bdev_direct_access(bdev, &dax);
- *kaddr = dax.addr;
- *pfn = dax.pfn;
-
- return ret;
+ ret = bdev_dax_pgoff(bdev, dev_sector, nr_pages * PAGE_SIZE, &pgoff);
+ if (ret)
+ return ret;
+ return dax_direct_access(dax_dev, pgoff, nr_pages, kaddr, pfn);
}
/*
@@ -448,7 +447,7 @@
.status = stripe_status,
.iterate_devices = stripe_iterate_devices,
.io_hints = stripe_io_hints,
- .direct_access = stripe_direct_access,
+ .direct_access = stripe_dax_direct_access,
};
int __init dm_stripe_init(void)