dm thin metadata: add dm_thin_find_mapped_range()
Retrieve the next run of contiguously mapped blocks. Useful for working
out where to break up IO.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
diff --git a/drivers/md/dm-thin-metadata.h b/drivers/md/dm-thin-metadata.h
index fac01a9..f11f140 100644
--- a/drivers/md/dm-thin-metadata.h
+++ b/drivers/md/dm-thin-metadata.h
@@ -147,6 +147,15 @@
int can_issue_io, struct dm_thin_lookup_result *result);
/*
+ * Retrieve the next run of contiguously mapped blocks. Useful for working
+ * out where to break up IO. Returns 0 on success, < 0 on error.
+ */
+int dm_thin_find_mapped_range(struct dm_thin_device *td,
+ dm_block_t begin, dm_block_t end,
+ dm_block_t *thin_begin, dm_block_t *thin_end,
+ dm_block_t *pool_begin, bool *maybe_shared);
+
+/*
* Obtain an unused block.
*/
int dm_pool_alloc_data_block(struct dm_pool_metadata *pmd, dm_block_t *result);