dm thin metadata: introduce dm_pool_abort_metadata

[deliverable/linux.git] / drivers / md / dm-thin-metadata.h

diff --git a/drivers/md/dm-thin-metadata.h b/drivers/md/dm-thin-metadata.h
index 2bbe622f299de81176807afbd94aeee1505d0ed4..0cecc3702885fb57452c013f83679fc437a393ca 100644 (file)
--- a/drivers/md/dm-thin-metadata.h
+++ b/drivers/md/dm-thin-metadata.h
@@ -79,6 +79,16 @@ int dm_pool_delete_thin_device(struct dm_pool_metadata *pmd,
  */
 int dm_pool_commit_metadata(struct dm_pool_metadata *pmd);
 
+/*
+ * Discards all uncommitted changes.  Rereads the superblock, rolling back
+ * to the last good transaction.  Thin devices remain open.
+ * dm_thin_aborted_changes() tells you if they had uncommitted changes.
+ *
+ * If this call fails it's only useful to call dm_pool_metadata_close().
+ * All other methods will fail with -EINVAL.
+ */
+int dm_pool_abort_metadata(struct dm_pool_metadata *pmd);
+
 /*
  * Set/get userspace transaction id.
  */
@@ -150,6 +160,8 @@ int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block);
  */
 bool dm_thin_changed_this_transaction(struct dm_thin_device *td);
 
+bool dm_thin_aborted_changes(struct dm_thin_device *td);
+
 int dm_thin_get_highest_mapped_block(struct dm_thin_device *td,
                                     dm_block_t *highest_mapped);