dm snapshot: remove dm_snap header use

Move useful functions out of dm-snap.h and stop using dm-snap.h.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

1 files changed, 14 insertions, 2 deletions

diff --git a/drivers/md/dm-exception-store.h b/drivers/md/dm-exception-store.h
index 4dbf3577408e..835f402d9470 100644
--- a/drivers/md/dm-exception-store.h
+++ b/drivers/md/dm-exception-store.h
@@ -97,8 +97,6 @@ struct dm_exception_store {
         struct dm_exception_store_type *type;
         struct dm_target *ti;
 
-        struct dm_snapshot *snap;
-
         struct dm_dev *cow;
 
         /* Size of data blocks saved - must be a power of 2 */
@@ -152,6 +150,20 @@ static inline void dm_consecutive_chunk_count_inc(struct dm_snap_exception *e)
 
 #  endif
 
+/*
+ * Return the number of sectors in the device.
+ */
+static inline sector_t get_dev_size(struct block_device *bdev)
+{
+        return bdev->bd_inode->i_size >> SECTOR_SHIFT;
+}
+
+static inline chunk_t sector_to_chunk(struct dm_exception_store *store,
+                                      sector_t sector)
+{
+        return (sector & ~store->chunk_mask) >> store->chunk_shift;
+}
+
 int dm_exception_store_type_register(struct dm_exception_store_type *type);
 int dm_exception_store_type_unregister(struct dm_exception_store_type *type);