dm thin: generate event when metadata threshold passed

[karo-tx-linux.git] / drivers / md / dm-thin-metadata.c

diff --git a/drivers/md/dm-thin-metadata.c b/drivers/md/dm-thin-metadata.c
index f553ed66603c57efc1135c658ace9e149804ff1a..60bce435f4fa1443c2994bd483e70ea096c7aa92 100644 (file)
--- a/drivers/md/dm-thin-metadata.c
+++ b/drivers/md/dm-thin-metadata.c
@@ -1696,3 +1696,17 @@ void dm_pool_metadata_read_only(struct dm_pool_metadata *pmd)
        dm_bm_set_read_only(pmd->bm);
        up_write(&pmd->root_lock);
 }
+
+int dm_pool_register_metadata_threshold(struct dm_pool_metadata *pmd,
+                                       dm_block_t threshold,
+                                       dm_sm_threshold_fn fn,
+                                       void *context)
+{
+       int r;
+
+       down_write(&pmd->root_lock);
+       r = dm_sm_register_threshold_callback(pmd->metadata_sm, threshold, fn, context);
+       up_write(&pmd->root_lock);
+
+       return r;
+}