Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[~andy/linux] / drivers / md / dm-thin-metadata.h

diff --git a/drivers/md/dm-thin-metadata.h b/drivers/md/dm-thin-metadata.h
index b88918ccdaf688e3bc5f10478023276893cc3521..0cecc3702885fb57452c013f83679fc437a393ca 100644 (file)
--- a/drivers/md/dm-thin-metadata.h
+++ b/drivers/md/dm-thin-metadata.h
@@ -38,7 +38,8 @@ typedef uint64_t dm_thin_id;
  * Reopens or creates a new, empty metadata volume.
  */
 struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev,
-                                              sector_t data_block_size);
+                                              sector_t data_block_size,
+                                              bool format_device);
 
 int dm_pool_metadata_close(struct dm_pool_metadata *pmd);
 
@@ -78,6 +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.
  */
@@ -119,7 +130,7 @@ dm_thin_id dm_thin_dev_id(struct dm_thin_device *td);
 
 struct dm_thin_lookup_result {
        dm_block_t block;
-       int shared;
+       unsigned shared:1;
 };
 
 /*
@@ -147,6 +158,10 @@ int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block);
 /*
  * Queries.
  */
+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);
 
@@ -171,6 +186,12 @@ int dm_pool_get_data_dev_size(struct dm_pool_metadata *pmd, dm_block_t *result);
  */
 int dm_pool_resize_data_dev(struct dm_pool_metadata *pmd, dm_block_t new_size);
 
+/*
+ * Flicks the underlying block manager into read only mode, so you know
+ * that nothing is changing.
+ */
+void dm_pool_metadata_read_only(struct dm_pool_metadata *pmd);
+
 /*----------------------------------------------------------------*/
 
 #endif