1 files changed, 11 insertions, 0 deletions

diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 236880c1dc3..deac3b4e5e1 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -11,6 +11,7 @@
 #include <linux/bio.h>
 #include <linux/blkdev.h>
 
+struct dm_dev;
 struct dm_target;
 struct dm_table;
 struct mapped_device;
@@ -81,6 +82,15 @@ typedef int (*dm_ioctl_fn) (struct dm_target *ti, unsigned int cmd,
 typedef int (*dm_merge_fn) (struct dm_target *ti, struct bvec_merge_data *bvm,
                             struct bio_vec *biovec, int max_size);
 
+typedef int (*iterate_devices_callout_fn) (struct dm_target *ti,
+                                           struct dm_dev *dev,
+                                           sector_t physical_start,
+                                           void *data);
+
+typedef int (*dm_iterate_devices_fn) (struct dm_target *ti,
+                                      iterate_devices_callout_fn fn,
+                                      void *data);
+
 /*
  * Returns:
  *    0: The target can handle the next I/O immediately.
@@ -139,6 +149,7 @@ struct target_type {
         dm_ioctl_fn ioctl;
         dm_merge_fn merge;
         dm_busy_fn busy;
+        dm_iterate_devices_fn iterate_devices;
 
         /* For internal device-mapper use. */
         struct list_head list;