Change dm-linear to implement direct_access function,
linear_direct_access(), which maps sector and calls
direct_access function of its target device.
Signed-off-by: Toshi Kani <toshi.kani@xxxxxxx>
Cc: Alasdair Kergon <agk@xxxxxxxxxx>
Cc: Mike Snitzer <snitzer@xxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
---
drivers/md/dm-linear.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 05c35aa..49bd7d2 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -141,6 +141,22 @@ 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;
+ struct block_device *tbdev;
+ const struct block_device_operations *tops;
+ sector_t tsector;
+
+ lc = ti->private;
+ tbdev = lc->dev->bdev;
+ tops = tbdev->bd_disk->fops;
+ tsector = linear_map_sector(ti, sector);
+
+ return tops->direct_access(tbdev, tsector, kaddr, pfn, size);
+}
+
static struct target_type linear_target = {
.name = "linear",
.version = {1, 2, 1},
@@ -151,6 +167,7 @@ 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)
--
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