From: Toshi Kani <toshi.kani@xxxxxxx>
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: Toshi Kani <toshi.kani@xxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Cc: Alasdair Kergon <agk@xxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
---
drivers/md/dm-linear.c | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 05c35aa..6d35dd4 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -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)
--
2.7.4 (Apple Git-66)
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